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    U.S. sends 4,000 troops to Poland

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U.S. sends 4,000 troops to Poland

Russia says the deployment of U.S. troops to Poland is a "threat" to its security. CNN's Atika Shubert reports.

U.S. sends 4,000 troops to Poland

Russia says the deployment of U.S. troops to Poland is a "threat" to its security. CNN's Atika Shubert reports.