Russia and China asked the United Nations Security Council to vote on Friday on a draft resolution to delay by six months the reimposition of sanctions on Iran, diplomats said. All U.N. sanctions on Iran are due to be reimposed at 8 p.m. EDT on Friday (0000 GMT on Saturday) after Britain, France and Germany triggered a 30-day process accusing Tehran of violating a 2015 deal with world powers aimed at preventing it from developing a nuclear weapon. A resolution in the 15-member U.N. Security Council needs at least nine votes in favor and no vetoes by either Britain, France...