Opinion divided in Iran over the future of bilateral relations with Britain under Liz Truss, who had annoyed Tehran’s leadership with a hardline stance on nuclear talks.
Iran has been engaged for a year in negotiations with France, Germany, Britain, Russia and China directly, and the United States indirectly in the Austrian capital of Vienna to revive the 2015 nuclear agreement.
The sides are discussing a "collateral" obstacle, namely Iran's demand to have the Revolutionary Guard removed from a US terror blacklist, the EU foreign policy chief said.
The development enables resumption of talks that stalled after Moscow demanded assurances that sanctions over Ukraine won’t impact its ties with Tehran.
Complications have surfaced after Russia demanded guarantees that Western sanctions imposed on its economy would not affect its trade with Iran, analysts say.
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.
Several Iranian officials have said that a deal on Iran's nuclear programme is expected before the end of the week with some minor technical issues being discussed in Vienna.
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 Foreign Ministry spokesperson has said that an agreement to revive the 2015 nuclear deal can be reached very soon if the US and European parties show determination.
State Department's waivers announcement lifts sanctions threat against third parties that had been cooperating with non-military parts of Iran’s nuclear program under the terms of the 2015 deal.
Iranian Foreign Ministry has claimed the Western side realised it must "back down" from its "maximal demands," as nuclear talks in Vienna are set to resume.
Participants from Britain, France, Germany, China, Russia and Iran that are trying to revive a 2015 nuclear deal will resume their efforts on December 27.
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