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Airstrikes, this as the humanitarian situation deteriorates with critical supplies in some places scarce. with the war now dm its third week, casualties are adding up. so are russia's gains on the ground across ukraine, seen here in dark orange. tonight, cbs' chris livesay is in the city of odessa. >> reporter: well, here in the crucial port of odessa, the city is bracing for a fight as the ukrainian president accuses moscow of waging a war of annihilation. ♪ ♪ ♪ a war that once seemed unthinkable is now advancing funeral by funeral. mothers and wives clutch the hand of their soldiers, f...

Resistance. >> reporter: before the war started, this was unimaginable. outgunned and outmanned ukrainians stopping a russian armored column in its tracks. u.s. officials estimate the ukrainians have destroyed several hundred armored vehicles which are the heart of russian military power. >> the russian army is equipped with literally several thousandand, fairly modern battle tanks, and it's central to their way of war, which is focused on mass and on momentum. >> reporter: retired army colonel richard hooker, now with the atlantic council, says one of the weapons that has slowed the russian m...