As Mariupol's mayor urges residents to leave the besieged port city, a Ukrainian marine commander there makes a dire -- and perhaps final -- plea: "We might have only a few days or even hours left. The enemy's units are ten times larger than ours. We appeal to the world leaders to help us." Meanwhile, US defense officials watching the battlefield see no major Russian territorial gains in the Donbas region to Ukraine's east. Today's show opens with a live report from CNN's Matt Rivers on the ground in Lviv.

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