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India–Pakistan relations are the bilateral ties between the Republic of India and the Islamic Republic of Pakistan. The two countries have a complex and largely hostile relationship that is rooted in a multitude of historical and political events, most notably the partition of British India in August 1947. Two years after World War II, the United Kingdom formally dissolved British India, dividing it into two new sovereign nations: the Union of India and Pakistan. The partitioning of the former British colony resulted in the displacement of up to 15 million people, with the death toll estimated to have reached between several hundred thousand and one million people as Hindus and Muslims migrated in opposite directions across the Radcliffe Line to reach India and Pakistan, respectively. In 1950, India emerged as a secular republic with a Hindu majority population and a large Muslim minority. Shortly afterwards, in 1956, Pakistan emerged as an Islamic republic with a Muslim majority population and a large Hindu minority; it later lost most of its Hindu population following its defeat in the Bangladesh Liberation War of 1971, which saw the secession of East Pakistan as the independent country of Bangladesh. While both countries established full diplomatic ties shortly after their formal independence, their relationship was quickly overshadowed by the mutual effects of the partition as well as by the emergence of conflicting territorial claims over various princely states, with the most significant dispute being that of Jammu and Kashmir. Since 1947, India and Pakistan have fought three major wars and one undeclared war, and have also engaged in numerous armed skirmishes and military standoffs; the Kashmir conflict has served as the catalyst for every war between the two states, with the exception of the Indo Pakistani War of 1971, which instead occurred alongside the Bangladesh Liberation War. The India–Pakistan border is one of the most militarised international boundaries in the world. There have been numerous attempts to improve the relationship, notably the Shimla summit, the Agra summit, and the Lahore summit, as well as various peace and co operation initiatives. Despite those efforts, relations between the countries have remained frigid, following repeated acts of cross border terrorism. India has since successfully dehyphenated itself from Pakistan and has found creative ways and mechanisms to sidestep or corner Pakistan in international affairs. The "minimalist engagement" allows India to keep a "cold peace" with Pakistan and focus on other pressing issues and strategic challenges. Northern India and most of modern day Pakistan overlap with each other in terms of their common Indo Aryan demographic, natively speaking a variety of Indo Aryan languages (mainly Punjabi, Sindhi, and Hindi–Urdu). Although the two countries have linguistic and cultural ties, the size of India Pakistan trade is very small relative to the size of their economies and the fact that they share a land border. Trade across direct routes has been curtailed formally, so the bulk of India Pakistan trade is routed through Dubai in the Middle East. According to a BBC World Service poll in 2017, only 5% of Indians view Pakistan's influence positively, with 85% expressing a negative view, while 11% of Pakistanis view India's influence positively, with 62% expressing a negative view.

Massive population exchanges occurred between the two newly formed states in the months immediately following the partition. There was no conception that population transfers would be necessary because of the partitioning. Religious minorities were expected to stay put in the states they found themselves residing in. However, while an exception was made for Punjab, where the transfer of populations was organised because of the communal violence affecting the province, this did not apply to other provinces. The partition of British India split the former British province of Punjab and Bengal between the Dominion of India and the Dominion of Pakistan. The mostly Muslim western part of the province became Pakistan's Punjab province; the mostly Hindu and Sikh eastern part became India's East Punjab state (later divided into the new states of Punjab, Haryana and Himachal Pradesh). Many Hindus and Sikhs lived in the west, and many Muslims lived in the east, and the fears of all such minorities were so great that the Partition saw many people displaced and much inter communal violence. Some have described the violence in Punjab as a retributive genocide. Total migration across Punjab during the partition is estimated at 12 million people; around 6.5 million Muslims moved from East Punjab to West Punjab, and 4.7 million Hindus and Sikhs moved from West Punjab to East Punjab. According to the British plan for the partition of British India, all the 680 princely states were allowed to decide which of the two countries to join. With the exception of a few, most of the Muslim majority princely states acceded to Pakistan while most of the Hindu majority princely states joined India. However, the decisions of some of the princely states would shape the Pakistan India relationship considerably in the years to come.

Junagadh was a state on the south western end of Gujarat, with the principalities of Manavadar, Mangrol and Babriawad. It was not contiguous to Pakistan and other states physically separated it from Pakistan. The state had an overwhelming Hindu population which constituted more than 80% of its citizens, while its ruler, Nawab Mahabat Khan, was a Muslim. Mahabat Khan acceded to Pakistan on 15 August 1947. Pakistan confirmed the acceptance of the accession on 15 September 1947. India did not accept the accession as legitimate. The Indian point of view was that Junagadh was not contiguous to Pakistan, that the Hindu majority of Junagadh wanted it to be a part of India, and that the state was surrounded by Indian territory on three sides. The Pakistani point of view was that since Junagadh had a ruler and governing body who chose to accede to Pakistan, it should be allowed to do so. Also, because Junagadh had a coastline, it could have maintained maritime links with Pakistan even as an enclave within India. Neither of the states was able to resolve this issue amicably and it only added fuel to an already charged environment. Sardar Patel, India's Home Minister, felt that if Junagadh was permitted to go to Pakistan, it would create communal unrest across Gujarat. The government of India gave Pakistan time to void the accession and hold a plebiscite in Junagadh to pre empt any violence in Gujarat. Samaldas Gandhi formed a government in exile, the Arzi Hukumat (in Urdu: Arzi: Transitional, Hukumat: Government) of the people of Junagadh. Patel ordered the annexation of Junagadh's three principalities. India cut off supplies of fuel and coal to Junagadh, severed air and postal links, sent troops to the frontier, and occupied the principalities of Mangrol and Babariawad that had acceded to India. On 26 October, Nawab of Junagadh and his family fled to Pakistan following clashes with Indian troops. On 7 November, Junagadh's court, facing collapse, invited the Government of India to take over the State's administration. The Dewan of Junagadh, Sir Shah Nawaz Bhutto, the father of the more famous Zulfiqar Ali Bhutto, decided to invite the Government of India to intervene and wrote a letter to Mr. Buch, the Regional Commissioner of Saurashtra in the Government of India to this effect. The Government of Pakistan protested. The Government of India rejected the protests of Pakistan and accepted the invitation of the Dewan to intervene. Indian troops occupied Junagadh on 9 November 1947. In February 1948, a plebiscite held almost unanimously voted for accession to India.

Kashmir was a Muslim majority princely state, ruled by a Hindu king, Maharaja Hari Singh. At the time of the partition of India, Maharaja Hari Singh, the ruler of the state, preferred to remain independent and did not want to join either the Dominion of India or the Dominion of Pakistan. Despite the standstill agreement with Pakistan, teams of Pakistani forces were dispatched into Kashmir. Backed by Pakistani paramilitary forces, Pashtun Mehsud tribals invaded Kashmir in October 1947 under the code name "Operation Gulmarg" to seize Kashmir. The Maharaja requested military assistance from India. The Governor General of India, Lord Mountbatten, required the Maharaja to accede to India before India could send troops. Accordingly, the instrument of accession was signed and accepted during 26–27 October 1947. The accession as well as India's military assistance were supported by Sheikh Abdullah, the state's political leader heading the National Conference party, and Abdullah was appointed as the Head of Emergency Administration of the state the following week. Pakistan refused to accept the state's accession to India and escalated the conflict, by giving full fledged support to the rebels and invading tribes. A constant replenishment of Pashtun tribes were organised, and provided arms and ammunition as well as military leadership. Indian troops managed to evict the invading tribes from the Kashmir Valley but the onset of winter made much of the state impassable. In December 1947, India referred the conflict to the United Nations Security Council, requesting it to prevent the outbreak of a general war between the two fledgling nations. The Security Council passed Resolution 47, asking Pakistan to withdraw all its nationals from Kashmir, asking India to withdraw the bulk of its forces as a second step, and offering to conduct a plebiscite to determine the people's wishes. Though India rejected the resolution, it accepted a suitably amended version of it negotiated by the UN Commission set up for the purpose, as did Pakistan towards the end of 1948. A ceasefire was declared on 1 January the following year. However, India and Pakistan could not agree on the suitable steps for demilitarisation to occur as prelude to the plebiscite. Pakistan organised the rebel fighting forces of Azad Kashmir into a full fledged military of 32 battalions, and India insisted that it should be disbanded as part of the demilitarisation. No agreement was reached and the plebiscite never took place.

India and Pakistan have fought in numerous armed conflicts since their independence. There are three major wars that have taken place between the two states, namely in 1947, 1965 and the Bangladesh Liberation War in 1971. In addition to this was the unofficial Kargil War in 1999 and some border skirmishes. While both nations have held a shaky cease fire agreement since 2003, they continue to trade fire across the disputed area. Both nations blame the other for breaking the cease fire agreement, claiming that they are firing in retaliation for attacks. On both sides of the disputed border, an increase in territorial skirmishes that started in late 2016 and escalated into 2018 killed hundreds of civilians and made thousand homeless. India retaliated by launching a full scale military attack on West Pakistan. The seventeen day war caused thousands of casualties on both sides and witnessed the largest engagement of armored vehicles and the largest tank battle since World War II. Hostilities between the two countries ended after a United Nations mandated ceasefire was declared following diplomatic intervention by the Soviet Union and the United States, and the subsequent issuance of the Tashkent Declaration. The five week war caused thousands of casualties on both sides. Most of the battles were fought by opposing infantry and armoured units, with substantial backing from air forces, and naval operations. It ended in a United Nations (UN) mandated ceasefire and the subsequent issuance of the Tashkent Declaration.

Pakistan, since independence, was geo politically divided into two major regions, West Pakistan and East Pakistan. East Pakistan was occupied mostly by Bengali people. After a Pakistani military operation and a genocide on Bengalis in December 1971, following a political crisis in East Pakistan, the situation soon spiralled out of control in East Pakistan and India intervened in favour of the rebelling Bengali populace. The conflict, a brief but bloody war, resulted in the independence of East Pakistan. In the war, the Indian Army invaded East Pakistan from three sides, while the Indian Navy used the aircraft carrier to impose a naval blockade of East Pakistan. The war saw the first offensive operations undertaken by the Indian Navy against an enemy port, when Karachi harbour was attacked twice during Operation Trident (1971) and Operation Python. These attacks destroyed a significant portion of Pakistan's naval strength, whereas no Indian ship was lost. The Indian Navy did, however, lose a single ship, when INS Khukri (F149) was torpedoed by a Pakistani submarine. 13 days after the invasion of East Pakistan, 93,000 Pakistani military personnel surrendered to the Indian Army and the Mukti Bahini. After the surrender of Pakistani forces, East Pakistan became the independent nation of Bangladesh.

During the winter months of 1998–99, the Indian army vacated its posts at very high peaks in Kargil sector in Kashmir as it used to do every year. Pakistani Army intruded across the Line of Control and occupied the posts. Indian army discovered this in May 1999 when the snow thawed. This resulted in intense fighting between Indian and Pakistani forces, known as the Kargil conflict. Backed by the Indian Air Force, the Indian Army regained many of the posts that Pakistan had occupied. Pakistan later withdrew from the remaining portion under international pressure and high casualties.

The Indus Waters Treaty governs the rivers that flow from India into Pakistan. Water is cited as one possible cause for a conflict between the two nations, but to date issues such as the Nimoo Bazgo Project have been resolved through diplomacy.

In 1949, India recorded close to 1 million Hindu refugees, who flooded into West Bengal and other states from East Pakistan (now Bangladesh), owing to communal violence, intimidation and repression from authorities. The plight of the refugees outraged Hindus and Indian nationalists, and the refugee population drained the resources of Indian states, which were unable to absorb them. While not ruling out war, Prime Minister Nehru and Sardar Patel invited Liaquat Ali Khan for talks in Delhi. Although many Indians termed this appeasement, Nehru signed a pact with Liaquat Ali Khan that pledged both nations to the protection of minorities and creation of minority commissions. Khan and Nehru also signed a trade agreement, and committed to resolving bilateral conflicts through peaceful means. Steadily, hundreds of thousands of Hindus returned to East Pakistan, but the thaw in relations did not last long, primarily owing to the Kashmir conflict.

According to some reports published by the Council of Foreign Relations, the Pakistan military and the ISI have provided covert support to terrorist groups active in Kashmir, including the al Qaeda affiliate Jaish e Mohammed. Pakistan has denied any involvement in terrorist activities in Kashmir, arguing that it only provides political and moral support to the secessionist groups who wish to escape Indian rule. Many Kashmiri militant groups also maintain their headquarters in Pakistan administered Kashmir, which is cited as further proof by the Indian government. Journalist Stephen Suleyman Schwartz notes that several militant and criminal groups are "backed by senior officers in the Pakistani army, the country's ISI intelligence establishment and other armed bodies of the state."

Insurgents attack on Jammu and Kashmir State Assembly: A car bomb exploded near the Jammu and Kashmir State Assembly on 1 October 2001, killing 27 people on an attack that was blamed on Kashmiri separatists. It was one of the most prominent attacks against India apart from on the Indian Parliament in December 2001. The dead bodies of the terrorists and the data recovered from them revealed that Pakistan was solely responsible for the activity. Qasim Nagar Attack: On 13 July 2003, armed men believed to be a part of the Lashkar e Toiba threw hand grenades at the Qasim Nagar market in Srinagar and then fired on civilians standing nearby killing twenty seven and injuring many more. Assassination of Abdul Ghani Lone: Abdul Ghani Lone, a prominent All Party Hurriyat Conference leader, was assassinated by an unidentified gunmen during a memorial rally in Srinagar. The assassination resulted in wide scale demonstrations against the Indian occupied forces for failing to provide enough security cover for Mr. Lone. 20 July 2005 Srinagar Bombing: A car bomb exploded near an armoured Indian Army vehicle in the famous Church Lane area in Srinagar killing four Indian Army personnel, one civilian and the suicide bomber. Terrorist group Hizbul Mujahideen, claimed responsibility for the attack. Budshah Chowk attack: A terrorist attack on 29 July 2005 at Srinigar's city centre, Budshah Chowk, killed two and left more than 17 people injured. Most of those injured were media journalists. Murder of Ghulam Nabi Lone: On 18 October 2005, a suspected man killed Jammu and Kashmir's then education minister Ghulam Nabi Lone. No Terrorist group claimed responsibility for the attack. 2016 Uri attack: A terrorist attack by four heavily armed terrorists on 18 September 2016, near the town of Uri in the Indian state of Jammu and Kashmir, killed 18 and left more than 20 people injured. It was reported as "the deadliest attack on security forces in Kashmir in two decades". 2019 Pulwama attack: On 14 February 2019, a convoy of vehicles carrying security personnel on the Jammu Srinagar National Highway was attacked by a vehicle bound suicide bomber in Lethpora near Awantipora, Pulwama district, Jammu and Kashmir, India. The attack resulted in the death of 38 Central Reserve Police Force (CRPF) personnel and the attacker. The responsibility of the attack was claimed by the Pakistan based Islamist militant group Jaish e Mohammed.

The attack on the Indian Parliament was by far the most dramatic attack carried out allegedly by Pakistani terrorists. India blamed Pakistan for carrying out the attacks, an allegation which Pakistan strongly denied. The following 2001–2002 India–Pakistan standoff raised concerns of a possible nuclear confrontation. However, international peace efforts ensured the cooling of tensions between the two nuclear capable nations. Apart from this, the most notable was the hijacking of Indian Airlines Flight IC 814 en route New Delhi from Kathmandu, Nepal. The plane was hijacked on 24 December 1999 approximately one hour after takeoff and was taken to Amritsar airport and then to Lahore in Pakistan. After refuelling the plane took off for Dubai and then finally landed in Kandahar, Afghanistan. Under intense media pressure, New Delhi complied with the hijackers' demand and freed Maulana Masood Azhar from its captivity in return for the freedom of the Indian passengers on the flight. The decision, however, cost New Delhi dearly. Maulana, who is believed to be hiding in Karachi, later became the leader of Jaish e Mohammed, an organisation which has carried out several terrorist acts against Indian security forces in Kashmir. On 22 December 2000, a group of terrorists belonging to the Lashkar e Toiba stormed the famous Red Fort in New Delhi. The Fort houses an Indian military unit and a high security interrogation cell used both by the Central Bureau of Investigation and the Indian Army. The terrorists successfully breached the security cover around the Red Fort and opened fire at the Indian military personnel on duty killing two of them on spot. The attack was significant because it was carried out just two days after the declaration of the cease fire between India and Pakistan. In 2002, India claimed again that terrorists from Jammu and Kashmir were infiltrating into India, a claim denied by Pakistan President Pervez Musharraf, who claimed that such infiltration had stopped—India's spokesperson for the External Affairs Ministry did away with Pakistan's claim, calling it "terminological inexactitude". Only two months later, two Kashmiri terrorists belonging to Jaish e Mohammed raided the Swami Narayan temple complex in Ahmedabad, Gujarat killing 30 people, including 18 women and five children. The attack was carried out on 25 September 2002, just few days after state elections were held in Jammu and Kashmir. Two identical letters found on both the terrorists claimed that the attack was done in retaliation for the deaths of thousands of Muslims during the Gujarat riots. Two car bombs exploded in south Mumbai on 25 August 2003; one near the Gateway of India and the other at the famous Zaveri Bazaar, killing at least 48 and injuring 150 people. Though no terrorist group claimed responsibility for the attacks, Mumbai Police and RAW suspected Lashkar e Toiba's hand in the twin blasts. In an unsuccessful attempt, six terrorists belonging to Lashkar e Toiba, stormed the Ayodhya Ram Janmbhomi complex on 5 July 2005. Before the terrorists could reach the main disputed site, they were shot down by Indian security forces. One Hindu worshipper and two policemen were injured during the incident.

The 2001 Indian Parliament attack was an attack at the Parliament of India in New Delhi on 13 December 2001, during which fourteen people, including the five men who attacked the building, were killed. The perpetrators were Lashkar e Taiba (Let) and Jaish e Mohammed (JeM) terrorists. The attack led to the deaths of five terrorists, six Delhi Police personnel, two Parliament Security Service personnel and a gardener, in total 14 and to increased tensions between India and Pakistan, resulting in the 2001–02 India–Pakistan standoff.

The 2001–2002 India–Pakistan standoff was a military standoff between India and Pakistan that resulted in the massing of troops on either side of the border and along the Line of Control (LoC) in the region of Kashmir. This was the first major military standoff between India and Pakistan since the Kargil War in 1999. The military buildup was initiated by India responding to a 2001 Indian Parliament attack and the 2001 Jammu and Kashmir legislative assembly attack. India claimed that the attacks were carried out by two Pakistan based terror groups, the Lashkar e Taiba and Jaish e Mohammad, both of whom India has said are backed by Pakistan's ISI a charge that Pakistan denied. Tensions de escalated following international diplomatic mediation which resulted in the October 2002 withdrawal of Indian and Pakistani troops from the international border.

The 2007 Samjhauta Express bombings was a terrorist attack targeted on the Samjhauta Express train on 18 February. The Samjhauta Express is an international train that runs from New Delhi, India to Lahore, Pakistan, and is one of two trains to cross the India Pakistan border. At least 68 people were killed, mostly Pakistani civilians but also some Indian security personnel and civilians.

The 2008 Mumbai attacks by ten Pakistani terrorists killed over 173 and wounded 308. The sole surviving gunman Ajmal Kasab who was arrested during the attacks was found to be a Pakistani national. This fact was acknowledged by Pakistani authorities. In May 2010, an Indian court convicted him on four counts of murder, waging war against India, conspiracy and terrorism offences, and sentenced him to death. India blamed the Lashkar e Taiba, a Pakistan based militant group, for planning and executing the attacks. Indian officials demanded Pakistan extradite suspects for trial. They also said that, given the sophistication of the attacks, the perpetrators "must have had the support of some official agencies in Pakistan". In July 2009 Pakistani authorities confirmed that LeT plotted and financed the attacks from LeT camps in Karachi and Thatta. In November 2009, Pakistani authorities charged seven men they had arrested earlier, of planning and executing the assault. On 9 April 2015, the foremost ringleader of the attacks, Zakiur Rehman Lakhvi was granted bail against surety bonds of in Pakistan.

India has a long history of development of nuclear weapons. Origins of India's nuclear program dates back to 1944, when started its nuclear program soon after its independence. In 1971, India gained military and political momentum over Pakistan, after a successful military campaign against Pakistan. Starting preparations for a nuclear test in 1972, India finally exploded its first nuclear bomb in Pokhran test range, codename Smiling Buddha, in 1974. After the defeat in the Indo Pakistani war of 1971, Pakistan launched its own nuclear bomb program in 1972, and accelerated its efforts in 1974, after India exploded its first nuclear bomb in Pokhran test range, codename Smiling Buddha. This large scale nuclear bomb program was directly in response to India's nuclear program. In 1983, Pakistan achieved a major milestone in its efforts after it covertly performed a series of non fission tests, codename Kirana I. No official announcements of such cold tests were made by Pakistan government. The Pakistani government has denied the accusation and accused so called "state backed terror" in India.

India has accused some of the most wanted Indian fugitives, such as Dawood Ibrahim, of having a presence in Pakistan. On 11 May 2011, India released a list of 50 "Most Wanted Fugitives" hiding in Pakistan. This was to tactically pressure Pakistan after the killing of Osama bin Laden in his compound in Abbottabad. After two errors in the list received publicity, the Central Bureau of Investigation removed it from their website, pending review. After this incident, the Pakistani interior ministry rejected the list forwarded by India to Islamabad, saying it should first probe if those named in the list were even living in the country.

After the 1971 war, Pakistan and India made slow progress towards the normalisation of relations. In July 1972, Indian Prime Minister Indira Gandhi and Pakistani President Zulfikar Ali Bhutto met in the Indian hill station of Shimla. They signed the Shimla Agreement, by which India would return all Pakistani personnel (over 90,000) and captured territory in the west, and the two countries would "settle their differences by peaceful means through bilateral negotiations." Diplomatic and trade relations were also re established in 1976.

In 1997, high level Indo Pakistan talks resumed after a three year pause. The Prime Ministers of Pakistan and India met twice and the foreign secretaries conducted three rounds of talks. In June 1997, the foreign secretaries identified eight "outstanding issues" around which continuing talks would be focused. The conflict over the status of Kashmir, (referred by India as Jammu and Kashmir), an issue since Independence, remains the major stumbling block in their dialogue. India maintains that the entire former princely state is an integral part of the Indian union, while Pakistan insists that UN resolutions calling for self determination of the people of the state/province must be taken into account. It however refuses to abide by the previous part of the resolution, which calls for it to vacate all territories occupied. In September 1997, the talks broke down over the structure of how to deal with the issues of Kashmir, and peace and security. Pakistan advocated that the issues be treated by separate working groups. India responded that the two issues be taken up along with six others on a simultaneous basis. Attempts to restart dialogue between the two nations were given a major boost by the February 1999 meeting of both Prime Ministers in Lahore and their signing of three agreements. A subsequent military coup in Pakistan that overturned the democratically elected Nawaz Sharif government in October of the same year also proved a setback to relations.

In 2001, a summit was called in Agra; Pakistani President Pervez Musharraf turned up to meet Indian Prime Minister Atal Behari Vajpayee. The talks fell through. On 20 June 2004, with a new government in place in India, both countries agreed to extend a nuclear testing ban and to set up a hotline between their foreign secretaries aimed at preventing misunderstandings that might lead to a nuclear war. Baglihar Dam issue was a new issue raised by Pakistan in 2005. After Dr. Manmohan Singh become prime minister of India in May 2004, the Punjab provincial Government declared it would develop Gah, his place of birth, as a model village in his honour and name a school after him. There is also a village in India named Pakistan, despite occasional pressure over the years to change its name the villagers have resisted. Violent activities in the region declined in 2004. There are two main reasons for this: warming of relations between New Delhi and Islamabad which consequently lead to a ceasefire between the two countries in 2003 and the fencing of the Line of Control being carried out by the Indian Army. Moreover, coming under intense international pressure, Islamabad was compelled to take action against the militants' training camps on its territory. In 2004, the two countries also agreed upon decreasing the number of troops present in the region. Under pressure, Kashmiri militant organisations made an offer for talks and negotiations with New Delhi, which India welcomed. India's Border Security Force blamed the Pakistani military for providing cover fire for the terrorists whenever they infiltrated into Indian territory from Pakistan. Pakistan in turn has also blamed India for providing support to terrorist organisations operating in Pakistan such as the BLA. In 2005, Pakistan's information minister, Sheikh Rashid, was alleged to have run a terrorist training camp in 1990 in N. W. Frontier, Pakistan. The Pakistani government dismissed the charges against its minister as an attempt to hamper the ongoing peace process between the two neighbours. Both India and Pakistan have launched several mutual confidence building measures (CBMs) to ease tensions between the two. These include more high level talks, easing visa restrictions, and restarting of cricket matches between the two. The new bus service between Srinagar and Muzaffarabad has also helped bring the two sides closer. Pakistan and India have also decided to co operate on economic fronts. Some improvements in the relations are seen with the re opening of a series of transportation networks near the India–Pakistan border, with the most important being bus routes and railway lines. A major clash between Indian security forces and militants occurred when a group of insurgents tried to infiltrate into Kashmir from Pakistan in July 2005. The same month also saw a Kashmiri militant attack on Ayodhya and Srinagar. However, these developments had little impact on the peace process. An Indian man held in Pakistani prisons since 1975 as an accused spy walked across the border to freedom 3 March 2008, an unconditional release that Pakistan said was done to improve relations between the two countries. In 2006, a "Friends Without Borders" scheme began with the help of two British tourists. The idea was that Indian and Pakistani children would make pen pals and write friendly letters to each other. The idea was so successful in both countries that the organisation found it "impossible to keep up". The World's Largest Love Letter was recently sent from India to Pakistan.

In December 2010, several Pakistani newspapers published stories about India's leadership and relationship with militants in Pakistan that the papers claimed were found in the United States diplomatic cables leak. A British newspaper, The Guardian, which had the Wikileaks cables in its possession reviewed the cables and concluded that the Pakistani claims were "not accurate" and that "WikiLeaks [was] being exploited for propaganda purposes." On 10 February 2011, India agreed to resume talks with Pakistan which were suspended after 26/11 Mumbai Attacks. India had put on hold all the diplomatic relations saying it will only continue if Pakistan will act against the accused of Mumbai attacks. On 13 April 2012, following a thaw in relations whereby India gained MFN status in the country, India announced the removal of restrictions on FDI investment from Pakistan to India. The Foreign Minister of Pakistan on 11 July 2012, stated in Phnom Penh that her country is willing to resolve some of the disputes like, Sir Creek and Siachen on the basis of agreements reached in past. On 7 September 2012, Indian External Affairs Minister would pay 3 day visit to Pakistan to review the progress of bilateral dialogue with his Pakistani counterpart. In August 2019, following the approval of the Jammu and Kashmir Reorganisation Bill in the Indian Parliament, which revoked the special status of Jammu and Kashmir, further tension was brought between the two countries, with Pakistan downgrading their diplomatic ties, closing its airspace, and suspending bilateral trade with India. The Kartarpur Corridor was opened in November 2019.

On 25 February 2021, India and Pakistan issued a joint statement indicating that both sides agreed to stop firing at each other at the Line of Control (LOC, disputed de facto border) in Kashmir. Despite this, the Indian government has rejected Pakistan's call for talks, stating that "Peace, prosperity can't coexist with terrorism".

In response to the 2001 Gujarat earthquake, Pakistani President Pervez Mushrraf sent a plane load of relief supplies from Islamabad to Ahmedabad. They carried 200 tents and more than 2,000 blankets. Furthermore, the President called Indian PM to express his 'sympathy' over the loss from the earthquake.

India offered aid to Pakistan in response to the 2005 Kashmir earthquake on 8 October. Indian and Pakistani High Commissioners consulted with one another regarding cooperation in relief work. India sent 25 tonnes of relief material to Pakistan including food, blankets and medicine. Large Indian companies such as Infosys offered aid up to $226,000. On 12 October, an Ilyushin 76 cargo plane ferried across seven truckloads (about 82 tons) of army medicines, 15,000 blankets and 50 tents and returned to New Delhi. A senior air force official also stated that they had been asked by the Indian government to be ready to fly out another similar consignment. On 14 October, India dispatched the second consignment of relief material to Pakistan, by train through the Wagah Border. The consignment included 5,000 blankets, 370 tents, 5 tons of plastic sheets and 12 tons of medicine. A third consignment of medicine and relief material was also sent shortly afterwards by train. India also pledged $25 million as aid to Pakistan. India opened the first of three points at Chakan Da Bagh, in Poonch, on the Line of Control between India and Pakistan for earthquake relief work.

Amid the 2022 Pakistan floods, Indian Prime Minister Narendra Modi expressed his "heartfelt condolences to families of the victims". As of 30 August, it has been reported that the government of India is considering sending relief aid to Pakistan.

India and Pakistan, particularly Northern India and Eastern Pakistan, to some degree have similar cultures, cuisines and languages due to common Indo Aryan heritage which span through the two countries and throughout much of the northern subcontinent which also underpin the historical ties between the two. Pakistani singers, musicians, comedians and entertainers have enjoyed widespread popularity in India, with many achieving overnight fame in the Indian film industry Bollywood. Likewise, Indian music and film are very popular in Pakistan. Being located in the northernmost region of South Asia, Pakistan's culture is somewhat similar to that of North India, especially the northwest. The Punjab region was split into Punjab, Pakistan and Punjab, India following the independence and partition of the two countries in 1947. The Punjabi people are today the largest ethnic group in Pakistan and also an important ethnic group of northern India. The founder of Sikhism was born in the modern day Pakistani Punjab province, in the city of Nankana Sahib. Each year, millions of Indian Sikh pilgrims cross over to visit holy Sikh sites in Nankana Sahib. The Sindhi people are the native ethnic group of the Pakistani province of Sindh. Many Hindu Sindhis migrated to India in 1947, making the country home to a sizeable Sindhi community. In addition, the millions of Muslims who migrated from India to the newly created Pakistan during independence came to be known as the Muhajir people; they are settled predominantly in Karachi and still maintain family links in India. Relations between Pakistan and India have also resumed through platforms such as media and communications. Aman ki Asha is a joint venture and campaign between The Times of India and the Jang Group calling for mutual peace and development of diplomatic and cultural relations.

The India–Pakistan border is the official international boundary that demarcates the Indian states of Punjab, Rajasthan and Gujarat from the Pakistani provinces of Punjab and Sindh. The Wagah border is the only road crossing between India and Pakistan and lies on the famous Grand Trunk Road, connecting Lahore, Pakistan with Amritsar, India. Each evening, the Wagah Attari border ceremony takes place, in which the flags are lowered and guards on both sides make a pompous military display and exchange handshakes.

Hindustani is the lingua franca of North India and Pakistan, as well as the official language of both countries, under the standard registers Hindi and Urdu, respectively. Standard Urdu is mutually intelligible with standard Hindi. Hindustani is also widely understood and used as a lingua franca amongst South Asians including Sri Lankans, Nepalis and Bangladeshis, and is the language of Bollywood, which is enjoyed throughout much of the subcontinent. Apart from Hindustani, India and Pakistan also share a distribution of the Punjabi language (written in the Gurmukhi script in Indian Punjab, and the Shahmukhi script in Pakistani Punjab), Kashmiri language and Sindhi language, mainly due to population exchange. These languages belong to a common Indo Aryan family that are spoken in countries across the subcontinent.

Some Indian and Pakistani people marry across the border at instances. Many Indians and Pakistanis in the diaspora, especially in the United States, intermarry, as there are large cultural similarities between the two countries respectively. In April 2010 a high profile Pakistani cricketer, Shoaib Malik married the Indian tennis star Sania Mirza. The wedding received much media attention and was said to transfix both India and Pakistan.

Cricket and hockey matches between the two (as well as other sports to a lesser degree such as those of the SAARC games) have often been political in nature. During the Soviet invasion of Afghanistan General Zia ul Haq travelled to India for a bout of "cricket diplomacy" to keep India from supporting the Soviets by opening another front. Pervez Musharaff also tried to do the same more than a decade later but to no avail. From 2012, India stopped playing bilateral cricket series against Pakistan. Now it only plays against them in ICC and Asian Cricket Council events such as the Cricket World Cup, T20 World Cup, Asia Cup and ICC Champions Trophy. In 2017, the then Sports Minister of India, Vijay Goel opposed further bilateral series due to Pakistan's alleged sponsoring of terrorism, saying that "there cannot be sports relations between the two countries [while] there is terrorism from the Pakistani side." The Board of Control for Cricket in India (BCCI) also opposed any further series without the permission of the Indian government. The BCCI also does not allow Pakistani players to play in the Indian Premier League. In tennis, Rohan Bopanna of India and Aisam ul Haq Qureshi of Pakistan have formed a successful duo and have been dubbed as the "Indo Pak Express".

The large size of the Indian diaspora and Pakistani diaspora in many different countries throughout the world has created strong diasporic relations. British Indians and British Pakistanis, the largest and second largest ethnic minorities living in the United Kingdom respectively, are said to have friendly relations with one another. It is quite common for a "Little India" and a "Little Pakistan" to co exist in South Asian ethnic enclaves in overseas countries. There are various cities such as Birmingham, Blackburn and Manchester where British Indians and British Pakistanis live alongside each other in peace and harmony. Both Indians and Pakistanis living in the UK fit under the category of British Asian. The UK is also home to the Pakistan & India friendship forum. In the United States, Indians and Pakistanis are classified under the South Asian American category and share many cultural traits. In the US, intermarriage between Indians and Pakistanis is common. He narrowly escaped the Mumbai attacks at Hotel Taj in November 2008. Despite the atrocity, Karim does not wish the remaining killer Ajmal Kasab to be sentenced to death. He said: "I believe he had a fair and transparent trial and I support the guilty verdict. But I am not a supporter of capital punishment. I believe he should be given a life sentence, but that life should mean life."