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happening now. a war of words between presidents biden and putin in duelling speeches about the year-long afflict in ukraine. the u.s. president in poland delivering a rallying cry for the west, declaring ukraine will never be a victory for russia and calling out putin by name. over and over again. the russian leader in moscow defending his brutal invasion and taking his nuclear threat to a new level. by suspending a key articles control treaty with washington. welcome to our viewers in the united states and around the world. i'm wolf blitzer. you're in "the situation room." we begin...

ukraine. jim? >> anderson, thanks so much. this is "cnn tonight." i'm jim sciutto live from lviv in ukraine, along with the great laura coates in the u.s. the pentagon says tens of thousands of russian troops have now amassed in eastern ukraine. one of putin's commanders claims their new goal is to take full control of not just the donbas region in the east but southern ukraine to provide a land corridor to crimea and perhaps go further. still, president zelenskyy expressed hope and defiance tonight. >> translator: we will defend ourselves as long as necessary to break this ambition ...