The United States, Russia and Jordan have reached a ceasefire and "de-escalation agreement" in southwestern Syria, one of the combat zones in a six-year-old civil war, Washington and Moscow said on Friday.
The ceasefire will go into effect at noon Damascus time (0900 GMT) on Sunday, U.S. and Russian officials said.
The deal was announced after a meeting between U.S. President Donald Trump and Russian President Vladimir Putin at the G20 summit of major economies in the German city of Hamburg.
U.S. Secretary of State Rex Tillerson said the area covered by the ceasefire affects Jordan's security and is a "very complicated part of the Syrian battlefield."
Russia and Iran are the main international backers of Syrian President Bashar al-Assad while Washington supports some of the rebel groups fighting to topple him.
"I think this is our first indication of the U.S. and Russia being able to work together in Syria, and as a result of that we had a very lengthy discussion regarding other areas in Syria that we can continue to work together on to de-escalate the areas," Tillerson said.