Simla

The LoC began as the Ceasefire Line in 1949 after the first India-Pakistan war, and was renamed under the 1972 Simla Agreement.

Pakistan responded by threatening to exit the 1972 Simla Agreement, which formalised the LoC - though it hasn't followed through yet.

"This is significant because the Simla Agreement is the basis of the current LoC, which both sides agreed to not alter unilaterally in spite of their political differences," says Mr Krishna.

Soon after India suspended the IWT, Pakistan threatened to suspend a 1972 peace treaty called the Simla Agreement, which established the Line of Control, or de facto border between the countries.

As per the Simla agreement signed by the country's leaders, they "resolved to settle their differences by peaceful means through bilateral negotiations".