VIENNA (Reuters) - Britain urged Iran to show more flexibility in nuclear talks due to start on Tuesday while Tehran insisted its rights must be respected, highlighting gaps standing in the way of an historic deal by a Nov. 24 deadline.
U.S. Secretary of State John Kerry declined to make any predictions for what he called a "critical week", when negotiators from Iran and six world powers push to end a 12-year dispute over Tehran's nuclear program and dispel fears of a new war in the Middle East.
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