Donald Trump, Vladimir Putton, Vladimir Putin

Ukraine is bracing for a full scale invasion by Russia based on the most ominous warning from the United States. Tonight the Pentagon says Russian troops are ready to go and an attack could happen at any time.

A state of emergency just went into effect in Ukraine as darkness falls and conditions may be right for Vladimir Putins troops to make their move.

CNN is on the scene in Ukraine, in Russia, and in Washington for our special coverage of this global crisis.

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