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Happening now, breaking news.

Ukraine is bracing for a full-scale invasion by Russia based on the most ominous

warning yet 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 Putin's troops to make their move. I'll speak with a top State

Department official who says Putin is poised to start a war of carnage.

CNN is on the scene in Ukraine, in Russia,

here in Washington for our special coverage

of this global crisis. We want to welcome our viewers here in the United States

and around the world. I'm Wolf Blitzer, you're in the situation room. This is on the US officials are on high alert fearing Vladimir Putin is about to take Russia's invasion of Ukraine to the

next level and launch a full-scale attack. We begin our special coverage with

...