As the United States warns Ukraine that a full-scale Russian invasion is "imminent," CNN obtains new videos that show a further build-up of Russian troops and tanks, and the Pentagon says 80% of Russian forces are at a forward position ready to go, adding that Vladimir Putin has two dozen warships and special forces prepared to attack. And Russian state media reports that, according to a spokesman for the Kremlin, the heads of the pro-Russian separatist regions have allegedly asked Putin for "help repelling the aggression of Ukrainian-armed forces."

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