Russian Foreign Minister Sergey Lavrov called Saturday on the United States to take a more active approach to help resume stalled talks aimed to revive the Iran nuclear deal.

"It seems evident they should be more active" in "resolving all issues related" to the accord, Lavrov told reporters at the United Nations in New York.

Lavrov added that he hoped negotiations in Vienna among Iran, Russia, China, France, Britain and Germany would resume "as soon as possible."

Earlier, Iranian Foreign Minister Hossein Amirabdollahian said that when his government says it will return soon to talks on resuming compliance with the 2015 nuclear deal, it means when Tehran has completed its review of the nuclear file.

On Friday, Amirabdollahian told reporters in New York that Iran would return to talks very soon, but gave no specific date.

In remarks broadcast on state TV channel IRINN on Saturday, Amirabdollahian said, People keep asking how soon is soon. Does it mean days, weeks or months? The difference between Iranian and Western soon is a lot.

To us, soon means really in the first opportune time - when our reviews (of the nuclear file) have been completed. What is important is our determination to return to the talks, but those that are serious and guarantee the Iranian nations rights and interests, Amirabdollahian said.

He was speaking to IRINN in New York on the sidelines of the UN General Assembly.

On the other hand, he said: "I remind you of the Wests promises, such as repeatedly promising they would soon, in a few months, implement the Instex"- a trade mechanism set up to barter humanitarian goods and food after the U.S. withdrawal from the deal.

Iran has said the channel with Europe has been ineffective.

Under the 2015 deal that Iran signed with world powers, it agreed to curb its nuclear program in return for the lifting of sanctions. Washington abandoned that deal in 2018 and unilaterally reimposed financial sanctions.

(With input from agencies)