France, Germany, Russia and the United States — met twice Tuesday without their Iranian counterparts.
They are seeking to hammer out a final accord to put an atomic bomb out of Iran’s reach in return for lifting a web of sanctions, after reaching a framework deal in April.
“We have no deadline,” a spokesman for the Iranian delegation told AFP.
For many observers July 9 had always been the real deadline, and the US team now has its back against the wall trying to nail down the final details by then.
If Kerry fails to hand over a deal by late Thursday, US lawmakers will get 60 days instead 30 to review and vote on it, which risks further complicating its implementation.
Despite progress on a series of complicated annexes, negotiations have hit hurdles on how to ease sanctions against Iran, probing allegations that in the past Tehran sought to develop nuclear arms, and ensuring Iran can continue to have a modest, peaceful nuclear programme.
Russian Foreign Minister Sergei Lavrov confirmed however that at the 11th hour a new problem had emerged — the lifting of a UN conventional arms embargo on Iran.
“I can assure you that there remains one major problem that’s related to sanctions: this is the problem of an arms embargo,” Lavrov told Interfax from Vienna.
Under the resolution, nations are banned from selling convention weapons such as tanks and missiles to Tehran. And Russia is believed to be eager to start selling such arms again.
An Iranian official revealed on Monday that Tehran was pushing for removal of any mention of a UN arms embargo in any final agreement.
“There is no evidence that the arms embargo has any relation with the nuclear issue,” the official said.
A fact sheet put out by the State Department as part of the April framework said that under the final deal there would be a new UN Security Council resolution to extend “important restrictions on conventional arms and ballistic missiles”.
Western officials are uneasy about allowing Iran to buy conventional weapons when it is accused of fomenting unrest in the Middle East, even though it is also fighting Islamic State militants, a common enemy for Washington and Tehran.
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