https://en.wikipedia.org/wiki/Indus_Waters_Treaty#Suspension
Following the suspension of the treaty, India significantly reduced the flow of water through the Chenab River, which crosses into Pakistan. Pakistani authorities claimed a 90% drop in water supply and accused India of choking the river’s flow. India also initiated new hydroelectric projects and began constructing dams on the western rivers, actions previously constrained under the treaty.[125][126][127]
Pakistan has reportedly warned that any attempt by India to disrupt the flow of water from shared rivers could be considered an act of war, and would attack India with nuclear weapons.[128]