Kyiv has accused Russia of a fresh military buildup on its border with Ukraine.
The Security Council said on November 6 that 60 unmarked armored vehicles, including 50 T-64 tanks, were moved to a town close to the border in the Rostov region of Russia.
The Ukrainian government also refuted allegations from pro-Russian separatists that they had launched a new offensive in eastern Ukraine, with military spokesman Vladyslav Seleznyov saying they were abiding by the September 5 cease-fire agreement.
Meanwhile, the self-proclaimed Donetsk People's Republic said the Ukrainian military had conducted a "massive mortar attack" on Donetsk's Kirovsky district.
And the Kremlin said President Vladimir Putin discussed the "deterioration of the situation" in eastern Ukraine with security chiefs following "repeated violations" of the cease-fire by Ukraine's armed forces