France and Spain are trying to get UN Security Council agreement for a resolution seeking a truce in the Syrian city of Aleppo, after the US ended its negotiations with Russia.
The draft text calls for a UN-sponsored truce monitor, an end to all fighting and military flights over the city.
Parties who fail to comply with the truce could face "further measures".
Russia immediately questioned the proposal and the grounding of flights, saying it was unlikely to bring peace.
The besieged rebel-held east of Aleppo has come under intense and sustained aerial bombardment by Syrian government and Russian forces since a truce brokered by the Washington and Moscow collapsed last month.