The committee is to include 150 members — a third picked by the regime, another by the opposition, and the remaining third by the United Nations.
Idlib's civil defence, a rescue service in opposition-controlled territory known as the White Helmets, says air strikes over the past 24 hours have hit several villages in the northwestern province.
The meeting comes as Ankara, Moscow and Tehran cooperate with increasing intensity on ending the over six-year war in Syria.
Syrian opposition says it will boycott Syria peace talks being held in Astana, demanding a complete end to regime bombardment on areas under rebel control.
The fifth round of Geneva talks concluded with neither the Syrian opposition or the regime saying if the talks have failed or succeeded.
The talks brokered by Russia and Turkey have brought the Syrian regime and rebel fighters to the table. But will they be able to bring lasting peace?
Foreign Minister Sergey Lavrov suggested Russian intervention had saved the Assad regime, and warned that some European countries were attempting to derail upcoming talks in the Kazakh capital.
Pressure is rising to stop a ferocious, three-week-old bombardment of eastern Aleppo by Syrian regime and Russian forces.
UN Special Envoy to Syria, Staffan de Mistura says that the next round of Peace Talks in Geneva is uncertain.
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