Syria's army and allied forces on Tuesday took full control from rebel groups of the strategic town of Salma, in the northwestern province of Latakia, state television reported.
On Tuesday, Russian strikes killed 35 civilians in the provinces of Idlib, in Syria's northwest, and Aleppo, in the north, the Observatory said.
Another 14 civilians, including three children, were killed in Russian raids on Manbij, a town in Aleppo province held by ISIS, the monitor said.
Last year, a U.S. official said as many as 2,000 fighters from Iran and its regional allies were supporting Syria's army in offensives against rebels.
The conflict in Syria erupted in March 2011 with anti-regime protests, which spiralled into a full-fledged war that has left more than 260,000 people dead and forced millions from their homes.
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