India has threatened before, in other moments of rising tensions, to pull out of the Indus Waters Treaty, which both countries signed in 1960. If India follows through this time, it could restrict the flow of water that is used for most of Pakistan’s crop irrigation and human consumption. Agriculture represents one-fourth of the country’s economy.

Tensions between India and Pakistan remain high days after Delhi launched airstrikes at its neighbor, sparking tit-for-tat military action from both sides and widespread confusion as competing claims and disinformation spread online.

India and Pakistan have fought three full-scale wars since they gained independence from Britain in 1947. They’ve also had dozens of skirmishes and conflicts.