During the face-off earlier this year between India and Pakistan over a terrorist attack that killed more than 40 Indian paramilitaries in Kashmir, New Delhi made an existential threat to Islamabad. The weapon was not India’s considerable nuclear arsenal, but one still capable of inflicting ruinous destruction: water.
“Our government has decided to stop our share of water which used to flow to Pakistan,” said Indian Transport Minister Nitin Gadkarikin on February 21. “We will divert water from eastern rivers and supply it to our people in Jammu and Kashmir and Punjab.” India controls three major rivers that flow into Pakistan.
If India had followed through, it would have abrogated the 1960 Indus Water Treaty (IWT) between the two counties, a move that could be considered an act of war.
https://www.counterpunch.org/2019/07/16/the-world-needs-a-water-treaty/