Russian diplomat participating in talks to save 2015 JCPOA accord says meeting in Vienna has been "successful," though salvage efforts will take time.
Talks aimed at salvaging 2015 nuclear deal between Iran and world powers is taking place in Austria's capital Vienna, with the US joining indirectly for the first time since President Joe Biden's arrival in the White House.
Tuesday's talks were declared "successful" by a Russian diplomat who however said that efforts to salvage deal will take time.
"The Joint Commission meeting of JCPOA was successful... The restoration of JCPOA will not happen immediately. It will take some time. How long? Nobody knows," Mikhail Ulyanov, Russia's Vienna-based envoy to international organisations, wrote on Twitter, referring to the pact by its acronym.
The US withdrew from the pact in 2018.
Difficult talks 'on the right track'
European intermediaries were shuttling between Iranian and US officials in Vienna as they sought to bring both countries back into full compliance with the deal.
Iran has steadily overstepped the accord's limits on its nuclear programme in response to Washington's unilateral withdrawal from the accord in 2018 and its reimposition of sanctions that have crippled the Islamic Republic's economy.
While Tehran has repeatedly rebuffed "direct and indirect negotiations" with its old foe, Washington said on Monday it expected the talks to be difficult. Neither side expected any early breakthrough.
"We are confident that we are on the right track, and if America's will, seriousness and honesty is proven, it could be a good sign for a better future for this agreement," Iranian government spokesman Ali Rabiei told reporters.
Reviving 2015 accord
The remaining parties to the deal have met at a Viennese hotel for preparatory talks amid snowy conditions in the Austrian capital, where the pact was originally reached in 2015.
Officials from Britain, France and Germany, are acting as intermediaries between Iran and the United States, shuttling between both delegations.
Russia and China, the other parties to the 2015 pact, are also attending.
The US delegation, headed by special envoy Rob Malley, is based in a nearby hotel.
President Biden's administration wants to revive the accord but has said this requires negotiations.
Under the 2015 accord, US and other economic sanctions on Tehran were removed in return for curbs on Iran's nuclear programme to make it harder to develop a nuclear weapon — an ambition Tehran denies.
"This is going to involve discussions about identifying the steps that the US has to take and identifying the steps that Iran is going to have to take," Malley told NPR radio on Tuesday morning.
"Because they've been increasingly in noncompliance with their nuclear commitments."
Highlighting the difficulties of getting a breakthrough, Majid Takht-Ravanchi, Iran's envoy to the United Nations and a former nuclear negotiator, put the onus firmly on the US.
"The US has so far failed to honor @POTUS campaign promise to rejoin the JCPOA (Joint Comprehensive Plan of Action). So this opportunity shouldn't be wasted," he said on Twitter.
"If US lifts all sanctions, Iran will then cease all remedial measures."
Iran's Supreme Leader Ayatollah Ali Khamenei, who has the final say on all state matters, has opposed any gradual easing of sanctions.
An EU official said working groups would be created with the aim of marrying lists of sanctions that the United States could lift and nuclear obligations that Iran should meet.
READ MORE: Russia, Iran urge US to rescue nuclear deal
Several days of talks ahead
Diplomats said Tuesday's talks could continue for several days to resolve some of the easier issues before resuming next week.
The aim is some form of a deal ahead of June's Iranian presidential election, the official said, although Iranian and US officials have said there is no rush.
The Biden administration has also said it will seek to build a "longer and stronger agreement" that would deal with other issues, including Iran's nuclear programme after the existing deal's existing terms begin to expire, Tehran's development of ballistic missiles, and its support for proxy forces across the Middle East.
It is not clear that Iran would engage in such discussions.
"What we would pursue is, first of all, a longer agreement ... it would be better, as in any arms control agreement, to see whether we could get a follow-on deal that extends the timelines," Malley said, adding that he wanted talks about all other issues.
"But we're much better off talking about all of that if we could at least put the current nuclear issue to the side and not have to worry every day about what the latest Iranian announcement will be," he said.