Turning point in the war?

In a critical moment in Putin's invasion of Ukraine, the battle for the Donbas region is underway. President Zelensky is vowing to fight on against a large scale Russian ground offensive. We've already seen efforts to break through Ukraine's front lines in three regions in the east. Meanwhile, in Mariupol, Russian forces have given that city's resistance fighters a second deadline to surrender. Today's coverage begins with a live report from CNN's Matt Rivers in Lviv.

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