US Secretary of State John Kerry arrived in Geneva yesterday to join talks on Iran's contested nuclear programme, with Tehran and six world powers appearing on the verge of a breakthrough to defuse the decade-old standoff.
The Chinese, Russian, French, British and German foreign ministers - Wang Yi, Sergei Lavrov, Laurent Fabius, William Hague and Guido Westerwelle - also prepared to take part in the push to seal an interim deal under which Iran would curb its nuclear work in exchange for limited relief from sanctions.
Diplomats said a formidable sticking point in the intense negotiations, which began on Wednesday, may have been overcome with compromise language that does not explicitly recognise Iran's claim to a "right to enrich" uranium but acknowledges all countries' right to their own civilian nuclear energy.
Russian deputy foreign minister Sergei Ryabkov said Iran's demand to continue construction of a heavy-water reactor near Arak that could, when operational, yield bomb-grade plutonium, remained one of the main outstanding issues.
Ryabkov said a breakthrough was closer now than at the Geneva talks of November 7-9, but he added: "Unfortunately I can't say that there is a certainty of reaching that breakthrough." Germany's Westerwelle said: "It's not a done deal. There's a realistic chance but there's a lot of work to do."
The powers' goal is to cap Iran's nuclear energy programme, which has a history of evading US investigations, to remove the risk of Tehran producing material suitable for bombs rather than electricity.
"We are close to a deal but still differences over two or three issues remain," said Iranian deputy foreign minister Abbar Araqchi, a senior negotiator.
A senior European diplomat had told reporters earlier that foreign ministers of the six states would come to Geneva only if there was an agreement to sign.
An interim accord on confidence-building steps would be designed to start a cautious process of detente with Iran after decades of estrangement, and banish the spectre of a devastating Middle East war over its nuclear quest.
The draft deal would have Iran suspend some sensitive nuclear activities, above all medium-level uranium enrichment, in exchange for the release of some of many billions of dollars in Iranian funds frozen in foreign bank accounts, and renewed trade in precious metals, petrochemicals and aircraft parts.
The United States might also agree to relax pressure on other countries not to buy Iranian oil. Tehran has made clear it wants a more significant dilution of the sanctions blocking its oil exports and use of the international banking system.
France's Fabius, who objected to what he felt was a one-side offer to Iran floated at the November talks, appeared guarded on arrival in Geneva early yesterday.
"I hope we can reach a deal, but a solid deal. I am here to work on that," he said. France has consistently taken a tough line over Iran's nuclear programme, helping Paris cultivate closer ties with Tehran's adversaries in Israel and the Gulf.
Kerry left for Geneva "with the goal of continuing to help narrow the differences and move closer to an agreement", a State Department spokeswoman said.
Diplomacy on Tehran's nuclear plans has revived remarkably since the election of Hassan Rouhani, a relative moderate, as president in June on promises of winning sanctions relief and cutting Iran's international isolation.
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