Nuclear rivals India and Pakistan have moved closer to military confrontation as Islamabad closed its airspace to Indian aircraft and warned that any effort by Delhi to interfere with the supply of water under a decades-old treaty would be viewed as an act of war.
In a series of escalating tit-for-tat moves since a massacre of Indian tourists in the disputed region of Kashmir earlier this week by Islamic militants, India ordered its citizens to return from Pakistan, while Pakistan expelled a number of Indian diplomats.
