It was an agreement came in front of India and Pakistan to stop the war and came to a mutual decision. To stop this blood-shedding on September 22, 1965, a ceasefire has been secured by the United Nations Security Council. The United Nation intervened when it became clear that the continued war had the possibility of endangering the lives of the larger population of both countries. After the continuous war of 17 days, no country seems to resume hostilities owing to the vulnerability of their people. Then the United Nation Security Council had to intervene into it.

Under Tashkent Agreement on January 10, 1966, the Prime Minister of India Lal Bahadur Shastri and the President of Pakistan Ayub Khan were invited to Tashkent, the Southern Soviet Uzbek Republic i.e. at the neutral venue. Then the subsequent agreement was signed by Lal Bahadur Shastri and Ayub Khan on January 10, 1966. The Agreement made both parties agree with withdrawing all their Armed Forces to the position they were on August 5, 1965. This agreement helped to restore the diplomatic relations, and to discuss the economy, refugee settlement, and other issues between both the countries.

The whole procedure of withdrawing forces between India and Pakistan was closely monitored by the United Nations Military Observer Group in India and Pakistan and the United Nations India-Pakistan Observation Mission. After the successful signing of the Agreement, on the very next day mid-night of January 10, 1966, the Prime Minister of India Lal Bahadur Shastri died due to a heart attack.

Meanwhile, after such a great loss to India, Shastri was succeeded by the new and first women Prime Minister of India i.e. Indira Gandhi. Though it is widely believed that Shastri was murdered under mysterious conditions, it was not a natural death as no autopsy has been performed and represented it as a natural death in front of the whole world.