In April 1965, a clash between border patrols erupted into fighting in the Rann of Kutch, a sparsely inhabited region along the south-western Indo-Pakistani border. When the Indians withdrew, Pakistan claimed victory.

Later, in August, hostilities broke out again in the 2nd Indo-Pakistani war, when the government of Pakistan launched a covert offensive across the ceasefire line into the Indian-administered Jammu and Kashmir. In early September, India retaliated by crossing the international border at Lahore. After three weeks, both India and Pakistan agreed to a UN-sponsored ceasefire.

In January 1966, the governments of India and Pakistan met at Tashkent and signed a declaration affirming their commitment to solve their disputes through peaceful means. They also agreed to withdraw to their pre-August positions.