A deadline for resolving a 12-year-old dispute over Iran's nuclear program may be extended from Monday until March because of sharp disagreements between Tehran and world powers, officials close to the talks said on Thursday.
U.S. Secretary of State John Kerry was due to meet Iranian Foreign Minister Mohammad Javad Zarif with European Union envoy Catherine Ashton to try to break the stalemate, but talk of an extension prompted calls for tougher sanctions in Washington.
The United States and its allies had hoped this week's talks in Vienna would be the culmination of months of difficult diplomacy between Iran and the United States, Britain, France, Germany, Russia and China on a comprehensive agreement.
The aim is to remove sanctions on Tehran in exchange for curbs on its atomic program. But the talks have long been deadlocked. The timing for lifting sanctions and the future scope of Iran's uranium enrichment are stumbling blocks.
"Important points of difference remain," French Foreign Minister Laurent Fabius told a news conference in Paris with Kerry.
The U.N. nuclear chief, Yukiya Amano, on Thursday highlighted another hurdle: Iran has yet to explain suspected atomic bomb research to the U.N. nuclear agency, one of the six powers' conditions for lifting sanctions.
The latest round of talks between the six and Iran began on Tuesday and are likely to last right up to a self-imposed Nov. 24 deadline for a final agreement.
"Some kind of interim agreement at this point is likely, or perhaps at best a framework agreement by Monday that needs to be worked out in the coming weeks and months," a Western diplomat told Reuters on condition of anonymity.
A senior Iranian official had similar expectations.
"We need more time to resolve technical issues and don't forget that the time frame for lifting sanctions is still a huge dispute," the Iranian official said, adding that an extension until March was a possibility. Western officials also suggested March was an option, with a resumption of talks in January.
The officials said, however, that Iran and the six were not actively discussing an extension yet and would push for a deal by the deadline, which has already been extended from July.
"The talks have been going in an overwhelmingly tense atmosphere. Time is running out," Russian Deputy Foreign Minister Sergei Ryabkov was quoted as saying by RIA Novosti news agency. Various meetings were under way and no one was talking about prolonging the talks, he said.
TIMING
Some hawkish members of Congress, citing Iran's nuclear program as a threat to Israel, expressed frustration over the prospect of an extended deadline. Many Republicans, who will control both houses of Congress from January, insist stiffer sanctions will force Iran to compromise.
"The thing that the Iranians need most is time to complete their atomic bomb. The president shouldn't give it to them," said Republican Senator Mark Kirk, co-author of a bill to slap tough sanctions on Iran.
Officials close to the negotiations, which began in February, say Iran wants all key sanctions on oil exports and banking terminated almost immediately, not merely suspended as the United States and European officials have said.
Tehran rejects Western allegations it is amassing the capability to produce atomic weapons and has refused to halt its enrichment program.
It has been under international sanctions for eight years and the U.S., European Union and U.N. measures have slashed its oil exports, causing inflation to soar and the value of its currency to plummet.
Western powers say the sanctions can be suspended gradually and in line with moves by Iran to restrain its nuclear activities and terminated only after Tehran has demonstrated full compliance with the terms of any deal.
They also want Iranian restrictions to last for 20 years, while Iranians are pushing for either months or a small number of years, diplomats say.
Western officials say Iran has refused to budge on enrichment, despite repeated offers of potential compromises.
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