The UN Security Council is set to hold a vote on a resolution authorising the deployment of monitors to Syria to oversee the ceasefire there.
A draft text was finalised by members yesterday, and will be voted on in New York today.
However, it is not clear whether Russia - which has vetoed two previous resolutions - will back the text.
Envoy Kofi Annan has called for a team to be deployed immediately to ensure compliance with his peace plan.
Several deaths were reported yesterday despite the ceasefire, as thousands of protesters took to the streets across the country in fresh revolt against President Bashar al-Assad.
Annan's plan aims to end over a year of violence in Syria which has killed over 9,000 people, mostly civilians.