WASHINGTON—Nuclear-armed rivals India and Pakistan have agreed to a ceasefire following U.S.-led talks to end an intensifying military confrontation, President Donald Trump announced in a post on his Truth Social media platform Saturday morning.

The India-Pakistan conflict was taking a dramatic turn for the worse, pitching the nuclear-armed neighbors into a dangerous spiral of tit-for-tat strikes.

The first sign of the ceasefire was a social-media post from Donald Trump. He said it came after a “long night of talks mediated by the United States”. That came as a surprise because the Trump administration had repeatedly signalled a lack of willingness to get involved.