The mayor of Mariupol is calling his city "a new Auschwitz" after weeks of relentless Russian bombardment. Meanwhile, Putin continues to shift his focus to the east and the so-called "liberation" of the Donbas region. Military analysts that could take months if not years. And Ukraine President Zelensky warns of more atrocities in Borodianka, another city which until recently was occupied by Russian troops. CNN's Fred Pleitgen was there and witnessed the aftermath. His eyewitness account begins our coverage.

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