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Happening now, breaking news. The US warns Russia could intensify its

attack on key very, very soon as Kremlin forces are being slowed but not stopped by Ukrainian fighters.

A miles long Russian military convoy is now on the move just outside the Ukrainian capital tonight.

This, as Vladimir Putin is raising fears

of an even wider and potentially

a much more dangerous war by putting his nuclear forces

on high alert.

We'll go live to our correspondence on the front lines of this conference. your We want to welcome our viewers in the United States and around the world.

I'm Wolf Blitzer, you're in the situation room.

This is

our U.S. officials fear Russian forces could be preparing for a second wave of their

invasion of Ukraine. They're warning that the worst of

this war may be coming soon, especially for residents of the Ukrainian capital.

...