Ukrainian officials say over a thousand women and children were hunkered down in the Mariupol theater-turned-bomb shelter reduced to rubble by a Russian airstrike. We've been told that survivors walked away from that building in what would be an incredible escape. The theater was apparently targeted despite the word "children" spelled out in Russian outside on both sides of the building. The Ukraine defense minister said whoever chose that target was a "monster." But while Russia continues to inflict heavy damage from the air, reports are their ground offensive is not going well and is largely stalled. CNN's Nick Paton Walsh begins our coverage from Ukraine.

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