If you have been "out of the loop" or confused by the many stop and start negotiations regarding this conflict, SouthFront offers an excellent and accurate summary of the latest ceasefire agreement engineered via communications between Russia and the US. The script in the article follows exactly the audio report in the 3:01m video provided.
On February 22, the US and Russia released a joint statement on the Terms for a Cessation of Hostilities in Syria and proposed the ceasefire commence at 00:00 (Damascus time) on Feb.27, 2016. The ceasefire is to be applied to those parties that have indicated their commitment to and acceptance of its terms and does not apply to ISIS Jabhat al-Nusra, Ahrar ash-Sham and other terrorist organizations designated by the UN Security Council.