US Under Secretary of State for Political Affairs Nicholas Burns was to huddle with Russian Deputy Foreign Minister Sergei Kislyak and Foreign Ministry political directors John Sawers of Britain, Stanislas de Laboulaye of France, Zhang Yan of China and Michael Schaefer of Germany at Britain’s UN mission from 2000 GMT, diplomats said. Germany, France and Britain have pursued three years of inconclusive negotiations to coax Tehran off its nuclear program in exchange for economic incentives.A Western diplomat told AFP that the ambassadors of the five veto-wielding permanent members of the Security Council — Britain, China, France, Russia and the United States — would join in at the end of the session. The gathering comes as the 15-member Security Council is reporting some headway in its bid to agree a revised Franco-British draft urging Iran to comply with International Atomic Energy Agency (IAEA) demands that it restore international confidence in its atomic program, which Iran insists is peaceful.