Iran and the United States failed to strike a deal Sunday to end the war in the Middle East, but there was no immediate return to hostilities and the region clung to hope that a fragile truce would hold.

US Vice President JD Vance left Pakistan after the talks -- the highest-level meeting between the two sides since the 1979 Islamic revolution -- and warned that Washington had made Tehran its “final and best offer” for a deal.

“We leave here with a very simple proposal,” he said. “We’ll see if the Iranians accept it.”

Iran’s parliamentary speaker Mohammad Bagher Ghalibaf said his negotiating team “put forward constructive initiatives but ultimately the other side was unable to gain the trust of the Iranian delegation in this round of negotiations”.