The U.S. team of Vance and special envoys Steve Witkoff and Jared Kushner made progress with Iran during the Islamabad talks, the vice president said.

Face-to-face talks would mark the highest-level engagement between Iran and the US since the 1979 Islamic Revolution.

As the US vice-president leads peace talks with Iran, he must balance warring factions, a demanding boss and his own political future.