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What's the U.S. plan on Russia's "all out" invasion? Plus, a look at the strategy for fighting ISIS.
(CNN) – The U.S. military is on the move. A U.S. guided missile destroyer, the USS Truxtun, entered the Black Sea Friday, part of a previously planned military exercise with Romania and Bulgaria.
But it comes as tension in neighboring Ukraine continues to simmer. CNN's Ivan Watson reports from the Bosphorus Strait.