Nadergholi Ebrahimi has asked Supreme Leader Khamenei to rethink Iran's nuclear policy if negotiations with the U.S. collapse.

A fourth round of talks between the US and Iran over Tehran's nuclear programme have taken place in Oman, with both sides agreeing to meet again. US Middle East Envoy Steve Witkoff said the discussions in Muscat were encouraging, while Iran's Foreign Minister Abbas Araghchi described them as "difficult but useful".

Suspected Islamist militants attacked a Nigerian army base and captured soldiers and ammunition during a raid in the insurgency-hit northeastern Borno state in the early hours of Monday, two security sources told Reuters.