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			 The negotiators ended talks in the Swiss city of Lausanne in the 
			early morning hours with an air of chaos, disunity and cacophony as 
			delegations scrambled to get contradictory viewpoints across. 
			 
			The six powers - the United States, Britain, France, Germany, Russia 
			and China - aim to stop Iran from gaining the capacity to develop a 
			nuclear bomb in exchange for easing international sanctions that are 
			crippling its economy. Iran says its nuclear program is peaceful. 
			 
			France's foreign minister, often seen as making the most stringent 
			demands of Iran, returned to Paris because things had not advanced 
			enough for "immediate deal". 
			 
			But as top negotiators from the powers met Iranian Foreign Minister 
			Mohammad Javad Zarif again on Wednesday, Russia and Iran expressed 
			optimism that an initial agreement was within reach. 
			 
			British Foreign Secretary Philip Hammond sounded a note of caution. 
			"I think we have a broad framework of understanding, but there are 
			still some key issues that have to be worked through," he told the 
			BBC. 
			  Western diplomats said Iran had on Tuesday reaffirmed its "nuclear 
			rights", suggesting the talks were again getting bogged down as they 
			entered their seventh day. 
			 
			Officials cautioned that any agreement would probably be fragile and 
			incomplete. 
			 
			"We hope to wrap up the talks by Wednesday night ... We insist on 
			lifting of financial, oil and banking sanctions immediately ... for 
			other sanctions we need to find a framework," senior Iranian 
			negotiator Abbas Araqchi told state television. "We insist on 
			keeping research and development with advanced centrifuges," he 
			said. 
			 
			Zarif said the talks had been "very good", though he acknowledged 
			that there were issues to be smoothed over. 
			 
			A preliminary deal would be a major milestone toward a final accord, 
			with an end-June deadline, that could end a 12-year standoff between 
			Iran and world powers and reduce the risk of another Middle East 
			war. 
			 
			The United States threatened on Tuesday to walk away if the current 
			talks yield no political framework accord. 
			 
			The talks have stalled on the issues of Iran's nuclear centrifuge 
			research, the lifting of U.N. sanctions and their restoration if 
			Iran breaches the agreement. 
			 
			RUSSIA SAYS KEY DETAILS AGREED 
			 
			Russian Foreign Minister Sergei Lavrov, who returned to Moscow, said 
			negotiators had reached a general accord on "all key aspects." 
			 
			But a diplomat close to the talks denied that such an agreement had 
			been reached, and French Foreign Minister Laurent Fabius left saying 
			he would only return if it was "necessary". 
			 
			"Things have progressed, but not enough ... that we can reach an 
			immediate deal," Fabius told reporters in Paris. "We are firm. We 
			want a robust deal with detailed checks." 
			 
			
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			China warned of failure and urged all sides to meet each other half 
			way. 
			 
			"If the talks are stuck then all previous efforts to resolve Iran's 
			nuclear standoff with the six major powers will have been wasted," 
			said the rare statement issued by the Chinese delegation after 
			Foreign Minister Wang Yi left Lausanne. 
			 
			The U.S. administration of President Barack Obama had committed to 
			meeting an end-March deadline for the outline political 
			accord.Negotiators have a tentative agreement on the rough outline 
			of a possible public statement on the progress they have made so far 
			that would also highlight areas of disagreement, diplomats close to 
			the talks said. But they have not agreed on all the key details 
			central to a political framework that would form the basis of a 
			future nuclear agreement, the diplomats said. 
			 
			Some parts of any understanding reached by the parties will likely 
			remain confidential. 
			 
			Failure to agree a detailed preliminary accord would add to 
			scepticism in the Republican-controlled U.S. Congress over an 
			emerging deal. Congress has warned it will consider imposing new 
			sanctions on Iran if there is no agreement this week. A Democrat, 
			Obama has threatened to veto any such sanctions moves. 
			 
			Lavrov said the possible agreement included the International Atomic 
			Energy Agency's monitoring of Iran's nuclear program as well as 
			steps to lift sanctions. Experts would work out technical details by 
			end-June. 
			
			
			  
			
			 
			 
			"One can say with enough confidence that ministers have reached a 
			general agreement on all key aspects of a final settlement to this 
			issue," Lavrov said. "It will be put down in writing over the next 
			few hours, maybe during the day." 
			 
			A senior Iranian negotiator said Tehran was willing to negotiate 
			until the deadlock was resolved. "Iran does not want a nuclear deal 
			just for the sake of having a deal, and a final deal should 
			guarantee the Iranian nation's nuclear rights," the negotiator, 
			Hamid Baidinejad, told reporters. 
			 
			(Additional reporting by Stephanie Nebehay in Lausanne, Gabriela 
			Baczynska in Moscow and Elizabeth Pineau in Paris; Editing by Giles 
			Elgood) 
			
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