This situation arose from the Simla Agreement, signed in 1972 between India and Pakistan, when the treaty failed to specify the last  or so of the cease-fire line from the end of the Line of Control to the border with China.
The Simla Agreement, signed in 1972 between India and Pakistan, did not clearly define the final portion of the cease-fire line from the Line of Control to the border with China. This ambiguity resulted in a situation that arose from the treaty's lack of clarity.