The Syrian regime drew sharp criticism for bombing the civilian-packed city in the final stage of the campaign.
Accusing the Syrian government of committing “many and large” ceasefire violations, the rebel groups on Monday threatened to boycott the peace conference scheduled in Astana, Kazakhstan for later this month.
Peace talks to be held in Kazakhstan within a month if truce survives.
At least 26 people, most of them children, were killed after Russian planes bombarded a residential area and a school complex in the province of Idlib in northwest Syria on Wednesday.
Rebel groups reject proposal calling it a plan to isolate & target them.
E.U. to push for strong condemnation of Moscow's role in Syria conflict.
Islamic State has repeatedly targeted rebel stronghold Azaz in the past.
Moscow calls U.K.'s allegations over convoy strike "Russophobic hysteria."
Opposition fighters reject president's proposal calling it a deception.
Battle intensifies as Russia deploys missile defense system at Syria base.
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