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chief nuclear negotiator Ali Bagheri Kani will return to Vienna on Sunday evening for talks on resolving the remaining issues in indirect negotiations with the United States to revive a 2015 deal, the official IRNA news agency reported.

Bagheri Kani, who flew to Tehran last week for consultations with Iranian officials, will "pursue the negotiations with a clear agenda aimed at resolving" the remaining issues, IRNA said.

Nournews, which is affiliated to Iran's Supreme National Security Council that is in charge of the talks dossier, said a council meeting stressed "the need to quickly resolve the remaining issues that border between agreement and dead end".

It did not name the sticking points, but the main remaining disputes appear to include the extent of rollback and questions about uranium traces found at several old but undeclared sites.

"No restriction on time can prevent the continuation of the talks for a good agreement," Nournews added.

Iran has made clear it wants an end to the oil and banking that are hurting its economy, while insisting also on the lifting of human rights and terrorism-related curbs.

Seriously reviewing draft of the agreement.

Had a phone call w today, & Mr Bagheri is in contact w Mr Mora. All trying to reach a good deal.

Our red lines are made clear to western parties.

Ready to immediately conclude a good deal, should they show real will.

— H.Amirabdollahian امیرعبداللهیان (@Amirabdolahian)

On Saturday, Iranian Foreign Minister Hossein Amir-Abdollahian said Tehran was ready to "immediately conclude" a deal in talks to revive its 2015 nuclear accord with world powers if Western powers show real will.

"Seriously reviewing draft of the agreement, our red lines are made clear to Western parties. Ready to immediately conclude a good deal, should they show real will," Amir-Abdollahian said on Twitter.

is due on Tuesday to report to the Iranian parliament on the progress of the talks, local media said.

On Friday, a senior USÌýState Department official said negotiators had made significant progress in the past week or so on reviving the deal but very tough issues remained.

The pact was abandoned in 2018 by then-, who also reimposed extensive sanctions on Iran.

The deal between Iran and world powers limited Tehran's enrichment of to make it harder for it to develop material for nuclear weapons, if it chose to, in return for a lifting of international sanctions against Tehran.

Other parties to the deal- Britain, China, France, Germany, and Russia -have shuttled between the two sides during the .