Putin's goals extend beyond Ukraine's east

A top Russian commander makes it clear that full control of Ukraine's south -- a 600-mile swath of strategic land along Ukraine's southern coast -- is also part of the Kremlin's invasion plan. Mariupol is one of those port cities on Putin's list, and new images show Russian tanks rolling through. The Kremlin says the city is captured but there are still Ukrainian fighters at a waterfront steel plant, and there are civilians taking shelter there, too. Mariupol's mayor says they are running out of food and water. CNN's Matt Rivers begins today's coverage in Lviv.

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