"The atrocious crimes of extremists are aimed at scaring the peaceful population, subverting attempts to reach a long term political settlement to the Syrian crisis in the interests of all Syrians and efforts to end violence and bloodshed," it said in a statement.
Moscow said it "decisively condemns" the "inhuman attacks by terrorists" and expressed condolences for the victims.
It also called for a "proper principled reaction from the international community."