UN-Arab League envoy Kofi Annan has said that Syria has agreed to a 10 April deadline to begin implementing a six-point peace plan.
The plan calls for an UN-supervised ceasefire by all parties, withdrawal of soldiers and heavy weapons from cities, and delivery of humanitarian aid.
Annan was briefing the UN Security Council in a closed session.
Violence in Syria continued yesterday, with activists reporting fighting in Idlib and Homs.
Annan has asked the Security Council for its backing of next Tuesday's deadline for Syria to partially implement his peace plan, with a full ceasefire within 48 hours.
Syria said last week it accepted the peace plan.
However, Annan cautioned the Security Council that so far there was no sign of President Bashar al-Assad's government keeping its promises on implementation.
Speaking after the briefing from Annan, US ambassador to the UN Susan Rice said they are still sceptical about broken promises.