The Syrian government began deploying on Monday in a major victory for President Bashar al-Assad and his principal ally Russia.
A U.S. military official said the situation across northeastern Syria was “deteriorating rapidly.”
Relief agencies have estimated that up to 400,000 civilians in the conflict zone may require aid and protection.
A major rescue operation is underway in parts of central and northern Japan following the typhoon’s landfall near Tokyo on Saturday.
Turkey’s continued push into Syria comes days after President Donald Trump cleared the way for Turkey’s air and ground offensive.