Moscow said today it had made a "quite specific" ceasefire proposal for Syria as foreign ministers gathered in Munich, hoping to revive a floundering peace process amid warnings of a "new world war".
With Syria peace talks derailed by the regime onslaught on Aleppo, the UN said 51,000 Syrians had fled the northern city this month as government forces backed by Russian bombers and Iranian fighters left the opposition there virtually surrounded.
"We made propositions for a ceasefire that are quite specific," Russian Foreign Minister Sergei Lavrov said as he sat down for talks with US counterpart John Kerry.
Moscow has refused to confirm reports that its ceasefire would take effect only on March 1, giving another three weeks to an offensive which the UN says could place 300,000 people under siege.
Observers say the bombardments on Aleppo have killed 500 people since they began on February 1.