"We don't want to see any actor inside or outside take actions or do things or espouse policies or programs that run afoul of that process," Kirby said.
Biden said US forces on Sunday conducted a dozen precision strikes within Syria targeting camps and operatives of the terrorist group Islamic State.
There is little evidence that Syria's allies will step in to help Assad, CNN reported.
"We constantly monitor what is happening in Syria," Netanyahu said, referring to the Syrian rebel attack that began on Saturday.
To preach to Israel about civilian deaths is hypocritical - the US should know better, given its track record.
This is the latest helicopter raid by US forces in Syria and appears to be part of an increase of these types of operations.
Formerly united against Islamic State, the Kurdish-led SDF and the Military Council supported by Arab tribal leaders have been fighting for several weeks.
What may have begun as local grievances has now evolved into much larger implications.
People in the region are independent and have complex alliances and allegiances.
Syria is accused by Arab governments and the West of producing the highly-addictive and lucrative amphetamine captagon and organizing its smuggling into the Gulf, with Jordan a main transit route.
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