The development enables resumption of talks that stalled after Moscow demanded assurances that sanctions over Ukraine won’t impact its ties with Tehran.
Iran has suspended talks with Saudi Arabia without providing a reason or a new date, but diplomats hope continued talks will ease tensions across the region.
Complications have surfaced after Russia demanded guarantees that Western sanctions imposed on its economy would not affect its trade with Iran, analysts say.
Russia seeks written assurances that American, European sanctions over Ukraine won't impact its relationship with Iran.
The visit by International Atomic Energy Agency head Rafael Grossi is seen as critical to clinching a return to the nuclear agreement, and comes parallel to negotiations in the Austrian capital.
The UN nuclear watchdog's Director General Rafael Mariano Grossi will meet with senior Iranian officials in Tehran to discuss the stockpile that the group says can easily be used for atomic weapons.
"This must not be postponed any longer and cannot be postponed any longer. Now is the time to finally say yes to something that represents a good and reasonable solution," German Chancellor Olaf Scholz says during a visit to Israel.
Senior US State Department official says negotiators have made significant progress regarding Iran nuclear deal and it's in a better position, but added some serious issues still remains.
"Being near the finish line is no guarantee to crossing it" and sealing an accord, Iran's chief negotiator Ali Bagheri Kani says.
In a letter addressed to President Ebrahim Raisi and read at parliament, 250 MPs out of the 290-strong assembly wanted guarantees from the West that they would not withdraw from a new deal.
The agreement will only buy time, "after which Iran can and may develop and install advanced centrifuges, without restrictions," Israeli Prime Minister Bennett said.
Iran’s supreme leader Ayatollah Ali Khamenei urged the importance of nuclear energy for his country, while again asserting that it had no interest in atomic bombs.
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