Pakistan ratified the Simla Agreement on 15 July 1972 and India was ratified on 3 August of the same year, effective 4 August 1972. The Simla Agreement ensured the withdrawal of troops from territories occupied by both sides during the war, with the exception of Kashmir. Over the next two years, all prisoners of war had returned home. (iii) Withdrawals will begin on the effective date of this agreement and will be concluded within 30 days.  This agreement is ratified by both countries in accordance with their respective constitutional procedures and enters into force from the date of exchange of the ratification instruments.  The agreement is the result of the determination of the two countries to “end the conflict and confrontation that have so far affected their relations”. He designed the steps to be taken to further normalize mutual relations and also defined the principles that should govern their future relations.   The Simla Agreement was signed on 3 July 1972 in Shimla, capital of the Indian state of Himachal Pradesh, between India and Pakistan.  This led to the war of liberation of Bangladesh in 1971, which led to the independence of Bangladesh, formerly known as East Pakistan and part of the territory of Pakistan. India entered the war as an ally of Bangladesh, which turned the war into an Indo-Pakistan war in 1971.  The Delhi Agreement on the Re-establishment of War and Civilian Internees is a tripartite agreement between these states, signed on 28 August 1973.
The agreement was signed by Kamal Hossain, the Foreign Minister of the Government of Bangladesh, Sardar Swaran Singh, the Indian Minister of Foreign Affairs and Aziz Ahmed, Minister of State for Defence and Foreign Affairs of the Pakistani government.   The immediate outcome of the 1971 war between India and Pakistan was the change of government in Pakistan and Zulfiqar Ali Bhutto, leader of the majority party of West Pakistan, took power on 20 December 1971. The 1971 war led to the dismemberment of East Pakistan. Pakistan had lost nearly 54% of its population, and 93,000 of its soldiers and civilians were in possession of India. That is why the first challenges of the new government should resolve the ausdematon state of emergency and the problem of prisoners of war as quickly as possible. After the war, India and Pakistan were in direct contact through diplomatic channels, and both recognized the need to begin negotiations. From 12 January 1972 to 30 April 1972, the two countries were willing to engage in dialogue through press releases and discussions began. Finally, it was agreed that talks between Pakistani President Zulfiqar Ali Bhutto and Indian Prime Minister Indra Gandhi would begin on 28 June 1972. The agreement did not prevent relations between the two countries from deteriorating until the armed conflict, the last time during the 1999 Kargil war.