The actual vote on the resolution, which was drafted by Bahrain with the support of the Arab countries in the Persian Gulf, is expected to be scheduled for Friday. But it remained unclear whether extra hours of diplomacy would bring the three veto-holding countries on board.

Russia, China and France are among the five permanent members of the council with veto power. There were also divisions over the resolution among the 10 nonpermanent members, according to diplomats.