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.
According to experts, the strategy of the world powers appears to be "pressuring Iran to bring the talks to a conclusion".
Washington says it's in the "very final stages" of talks in Vienna during which US will be able to determine whether or not a mutual return to compliance with JCPOA is in the offing.
Indirect talks between Iran and US on salvaging Tehran's 2015 nuclear deal with world powers resume after a 10-day break.
The visit comes after Tehran indicated that it is ready to consider direct talks with Washington if it feels it can get a "good nuclear 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.
Iran's head of nuclear energy Mohammad Eslami has said Tehran's targets related to enriching uranium are meeting its industrial and production needs.
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.
Tehran appears to be readying for a space launch as negotiations continue in Vienna over its tattered nuclear deal with world powers, according to an expert and satellite images.
US President Joe Biden orders his staff to prepare "additional measures" if troubled talks over Iran's nuclear programme, which resumed in Vienna, fail to reach a resolution.
Senior diplomats from France, Britain and Germany said Iran has demanded major changes, some of which were incompatible with the 2015 deal.
The warning came as world powers and Iran gather in Vienna to salvage the 2015 nuclear deal after a five-month hiatus.
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