Iran says it has made a constructive response to the final offer drafted by the European Union to salvage the 2015 nuclear deal.
Iranian Foreign Ministry spokesperson Nasser Kanaani said in a statement on Friday that Tehran had delivered its response to the EU.
The US and Iran have been negotiating through the EU to revive the deal, under which international sanctions would be lifted in return for Tehran cutting back its nuclear program.
On August 8, the EU presented to both sides what it described as its final text for a compromise.
Kanaani said Iran examined the US response, and that its own was delivered after evaluation at different levels.
He added that it included a constructive approach with the aim of finalizing the negotiations, but he did not elaborate.
President Ebrahim Raisi has indicated that, as a condition for a compromise, Tehran wants the International Atomic Energy Agency to close its probe into nuclear materials found at undeclared sites.
Foreign Minister Hossein Amir-Abdollahian is requesting stronger guarantees to have a sustainable deal.
The two sides remain far apart over these issues.