A Western official said on Wednesday that Russia has made a proposal to begin a ceasefire in Syria on March 1, but the official said no agreement has been reached on the Russian offer.
The official said the United States has concerns about some elements of the Russian proposal.
Meanwhile, several United Nations Security Council members also pressed Russia on Wednesday to stop bombing around Syria's Aleppo in support of a Syrian military offensive and allow humanitarian access ahead of a crucial meeting of major powers in Germany on the conflict.
The 15-member Security Council met behind closed doors to discuss the situation after the U.N. warned that hundreds of thousands of civilians could be cut off from food if Syrian government forces encircle rebel-held parts of Aleppo.
“Russia’s air strikes have been a direct cause of this crisis around Aleppo,” New Zealand's U.N. Ambassador Gerard van Bohemen told reporters after a briefing by U.N. aid chief Stephen O’Brien. New Zealand and Spain requested the meeting.