Happening now.

Air-aid sirens have been blaring across Ukraine right now as the battered city of Odessa

braces for a fourth night of Russian retaliatory strikes.

CNN is in the war zone where forces from Moscow and Kyiv are trading new attacks and threats.

And the Ukrainian ambassador to the United States will join us live this hour.

Also tonight, CNN is learning about the Special Counsel's plans

to call more key witnesses, the January 6th Grand Jury wrapping up its secret work for the day as a potential indictment of Donald Trump looms.

And House Republicans put the spotlight on a controversial Democrat who's challenging President Biden, Robert

Kennedy Jr., testifying in a heated hearing and trying to rewrite the

history of his remarks that have been condemned by his party and his own famous family.

Welcome to our viewers here in the United States and around the world.

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

We begin our coverage tonight in the key Ukrainian port city of Odessa as residents there prepare for a fourth consecutive night of major Russian attacks.

CNN senior national security correspondent Alex Markord is on the ground for us there.

Alex you've witnessed these attacks up close since the first night.

What's the latest?

Well Wolf, this city is anxiously awaiting to see whether Russia intends to target again after these three

nights of intense attacks.

These were the worst strikes over the past three nights that this city has seen since the

beginning of this war. We just heard from President Salinsky in his nightly

address saying that over the past four days some 90 Shahhead drones have been fired at Southern Ukraine and some 70 missiles.

Just last night we saw Russia use four different kinds of cruise missiles,

...