Parties trying to revive the Iran nuclear deal scrambled Wednesday to resolve last-minute Russian demands that threaten to scupper negotiations, diplomats said, with the United States appearing unwilling to engage with Russia on the matter. 

Western powers on Tuesday warned Russia against wrecking an almost completed deal on bringing the United States and Iran back into compliance with the 2015 nuclear accord. Iran’s top negotiator returned to Vienna on Wednesday from consultations in Tehran. 

Eleven months of talks to restore the deal, which lifted sanctions on Iran in return for curbs on its nuclear program, have reached the final stages, with several diplomats saying the nuclear deal was now broadly agreed upon. 

But just as the final issues were being resolved, Russia presented a new obstacle by demanding written guarantees from the United States that Western sanctions targeting Moscow over its invasion of Ukraine would not affect its trade with Iran. 

“The negotiations on the ‘nuclear deal’ with Iran should take into account the legitimate interests of Russia in the implementation of comprehensive cooperation with Iran,” the Russian Embassy in Iran said on Twitter, summarizing a news conference held in Tehran by its ambassador, Levan Dzhagaryan. 

Russia’s chief envoy to the talks, Mikhail Ulyanov, retweeted that comment. He met the talks’ coordinator, Enrique Mora of the European Union, on Tuesday night and again on Wednesday.

Demands not made clear

U.S. Undersecretary of State for Political Affairs Victoria Nuland on Tuesday accused Russia of seeking to reap extra benefits from its participation in the effort to restore the nuclear agreement, but she said Washington would not be playing along. She said the exact nature of Moscow’s demands still wasn’t clear but appeared broader than its nuclear commitments to revive the deal. 

A European diplomat said Russia was demanding sweeping guarantees on trade between Moscow and Tehran.

They said the talks now were not likely to end this week.

Mora broke off informal meetings on Monday, saying the time had come for political decisions to be taken to end the negotiations.

European negotiators from France, Britain, and Germany already had temporarily left the talks, as they believed they had gone as far as they could go, and it was now up to the United States and Iran to agree on outstanding issues. 

Iran’s chief negotiator, Ali Bagheri Kani, returned to Tehran unexpectedly after Russian Foreign Minister Sergey Lavrov outlined Moscow’s new demands. Iran’s foreign minister said at the time that Tehran would not let its interests be harmed by “foreign elements.”

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