Iran’s Foreign Minister Abbas Araghchi said Tehran and Washington have agreed on a set of guiding principles for a potential deal, while noting that no date has been determined for a third round of talks between the two sides.

"Ultimately, we were able to reach broad agreement on a set of guiding principles, based on which we will move forward and begin working on the text of a potential agreement," Araghchi told state TV after the talks in Geneva, which he described as "more constructive" than the previous round earlier this month.

"I can say that, compared with the previous round, fully serious discussions were raised and the atmosphere was more constructive," he added.

Tehran and Washington held Tuesday a second round of negotiations – which began earlier this month – after talks last year collapsed following Israel's attack on Iran in June, which triggered a 12-day war.

That war saw the United States briefly join Israel with strikes on key Iranian nuclear sites.