Tehran, Iran – Another round of indirect talks between Iranian and United States officials ended with a mediator claiming “significant progress” but still no clear evidence that either side was willing to concede enough on their positions to avoid war.

After the conclusion of the talks in Geneva on Thursday, Iranian Foreign Minister Abbas Araghchi said further technical talks would be held next week in Vienna and progress had been “good”.

“These were the most serious and longest talks,” Araghchi said.

Omani Foreign Minister Badr bin Hamad Al Busaidi, who mediated the talks, said Iranian and US diplomats would consult with their governments before the Vienna talks.

Few details have emerged about the discussions, but Araghchi was reported to have met US envoy Steve Witkoff – if only briefly, according to Iran’s Tasnim news agency.

The Iranian team, led by Araghchi, handed over on Wednesday night Tehran’s written proposals to Al Busaidi, who also mediated previous rounds of talks in Geneva and Muscat.

The Omani diplomat then met with the US delegation on Thursday, led by Witkoff and US President Donald Trump’s son-in-law Jared Kushner. Al Busaidi mediated between the two teams throughout the day, and the US delegation also held separate talks over Ukraine.

Also taking part in the talks was Rafael Grossi, the director general of the International Atomic Energy Agency (IAEA), which will have to undertake nuclear monitoring and verification duties in Iran in case of any agreement.

The UN watchdog will hold several days of board meetings starting on March 6, which is around the 10- to 15-day deadline floated by Trump last week for Iran to reach a deal.