REUTERS - A diplomatic breakthrough is unlikely on a nuclear deal to end sanctions against Iran when talks resume in New York this week between Tehran and six world powers deadlocked after a year of negotiations.
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The talks between Iran and the United States, Britain, France, Germany, Russia and China are re-starting after a two-month hiatus and amid Washington and Tehran ruling out cooperation on fighting Islamic State militants who have taken over swaths of Iraq and Syria.
Iranian Foreign Minister Mohammad Javad Zarif and European Union foreign policy chief Catherine Ashton will discuss the negotiations on a long-term nuclear deal over lunch on Thursday, diplomats said. The EU has been a kind of interlocutor for the six powers.
Diplomats from the six countries will begin meeting among themselves on Thursday before they all sit down with the Iranian delegation on Friday. The negotiations are expected to run until at least September 26 on the sidelines of next week's annual gathering of world leaders at the United Nations General Assembly.
U.S. Under Secretary of State for Political Affairs Wendy Sherman, who heads the U.S. delegation, said in a speech at Georgetown University on Tuesday that more movement from Iran will be needed to secure a long-term agreement.
"We can say on the positive side that our talks have been serious and that we have identified potential answers to some key questions," Sherman said. She also said "we remain far apart on other core issues, including the size and scope of Iran's uranium enrichment capacity."
Iran denies Western allegations that it is refining uranium to develop the capability to assemble nuclear weapons, saying it is doing it to help generate electricity.
The United States and its allies have in recent years imposed ever tighter financial and others sanctions on Iran, a major oil producer, to make it scale back its nuclear program.
Western governments want Iran to have a centrifuge capacity in the low, single-digit thousands so that it would take Tehran a long time to use the machines to purify enough uranium to fuel an atomic weapon. Tehran has rejected demands to significantly reduce the number below the more than 19,000 it has now installed, of which roughly half are operating.
Last week, Zarif's deputy Abbas Araqchi criticized what he called the "illogical demands" of the Western powers. Araqchi also said: "We are always optimistic...but we have a difficult road to go."
Iran, diplomats close to the talks said, appears unwilling to reduce the number of its centrifuges to below 10,000.
But that would be an unacceptable for the six powers, who diplomats say are aiming to have a deal in place that leaves Iran in a position where it would need at least one year to produce enough high enriched uranium for a single bomb.
"On the question of enrichment we have practically made no progress," a senior Western diplomat said. "The six want that in case the agreement is broken and the nuclear activities restart towards a military objective, that we have a breakout capacity of a year."
Diplomats said a breakthrough in the New York negotiations was unlikely.
"Things remain blocked," the senior Western diplomat said. "New York will be vital to see if we can break the impasse."
Depending on how the negotiations among senior foreign ministry officials go in the coming days, another Western diplomat said foreign ministers might join the talks late next week "if good progress is being made or if there's a blockage."
Talks between Iran and the six were formally started during last year's General Assembly, when Zarif and U.S. Secretary of State John Kerry sat side-by-side during a special side meeting. Last November in Geneva, Iran and the six reached an interim agreement under which Tehran won some easing of sanctions in return for halting its most sensitive nuclear work.
But they failed to meet a July 20 target for a comprehensive agreement under which Iran would further curb its atomic activities in exchange for a gradual lifting of sanctions, and they set a new deadline of November 24.
The six powers have tried to keep the negotiations focused exclusively on the nuclear issue, but the U.S. and Iranian delegations have occasionally discussed other topics. Iran said earlier this week that it had rejected a U.S. offer to cooperate on the threat posed by the Islamic State but Washington indicated that there was no such offer.