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Asked if it is possible for Russians to participate as peacekeepers in Donbas, Volker said: "I can't imagine it."

Read alsoPoroshenko, Volker coordinate further steps on strengthening int'l presence in DonbasAccording to Nayyem, it is critically important for Volker that the peacekeeping mission is militarized, not just monitoring, and act along the Russian-Ukrainian border that is now beyond Ukraine's control.

"Volker expects that the UN resolution on peacekeepers in Donbas can be adopted before the end of this year," he added.