Russian airstrikes have killed 36 civilians in Syria's north-western Idlib province on Monday, the Syrian Observatory for Human Rights said.
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"There are children among the killed," the head of the observatory, Rami Abdel Rahman, told dpa.
"This is the highest civilian toll since Idlib was declared a de-escalation zone," he added.
On September 15, Russia, Turkey and Iran agreed to create a so-called "de-escalation zone" in Idlib, an area under the control of opposition forces in northern Syria.