On March 11, 1985, Mikhail Gorbachev became leader of the Soviet Union, and within a few weeks the full-scale reformation he attempted to carry out both inside his country and in its cold war relations with the West, particularly the United States, began to unfold.
Both sides have tried all alternatives - ranging from ignoring the other side (India), to the use of force (Pakistan), to the threat of the use of force (India again). Now both sides have run out of options other than to sit across the table and talk.