Iran and the United States have agreed to continue nuclear talks next week, both sides said, as Iranian Foreign Minister Abbas Araghchi said he was “extremely cautious” about the potential success of the negotiations aimed at resolving a decades-long nuclear standoff, Aljazeera reported.

US President Donald Trump has signalled confidence in clinching a new pact with the Islamic republic that would block Tehran’s path to a nuclear bomb.

On Saturday, Araghchi and Trump’s Middle East envoy Steve Witkoff held a third round of indirect talks in Oman’s capital Muscat through Omani mediators for about six hours, a week after a second round in Rome that both sides described as constructive.

“The negotiations are extremely serious and technical … there are still differences, both on major issues and on details,” Araghchi told Iranian state TV, according to Aljazeera.

“There is seriousness and determination on both sides … However, our optimism about success of the talks remains extremely cautious.”