Diplomats say growing signals that differences between Iran and six power group narrowing

VIENNA�A senior Iranian official raised the possibility of improved relations with the U.S. if a nuclear accord is reached between Tehran and world powers this month, amid signs that the negotiations were progressing slowly.

French Foreign Minister Laurent Fabius, among several top diplomats who joined the talks on Thursday, said before leaving Vienna that he would return Sunday�indicating little chance of an agreement before then.

�There is still some work to be done and I expect to come back to the talks Sunday evening,� he said. �I hope at that moment�we will be in a situation to advance toward perhaps�let�s hope so�a final resolution which will allow for a robust deal.�

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This article was written by Jay Solomon & Laurence Norman for The Wall Street Journal on July 2, 2015. Jay Solomon writes about foreign affairs and national security from The Wall Street Journal's Washington DC bureau. His coverage areas include international diplomacy, nuclear weapons proliferation, counter-terrorism and Middle East and Asian affairs.