A key Russian warship has sunk off the Ukrainian coast. Ukraine claims it conducted a missile strike on the vessel while Russia claims the damage was the result of a fire. The Pentagon cannot confirm if the damage was a result of a Ukrainian attack.
Also, U.S. officials warn that Russia has amassed significant forces in eastern Ukraine, potentially signaling a brutal new offensive. CNN is inside towns on the brink of assault where civilians are taking shelter.
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The Situation Room with Wolf Blitzer and Pamela Brown