FILE-In this Sept. 17, 2017 file photo provided by the Polish Armed Forces General Command a tank takes part in the Dragon 17 exercise in Drawsko Pomorskie, Poland. Hundreds of U.S. soldiers have begun arriving in Germany in the first test of a new rapid deployment strategy meant to bolster NATOs presence in Eastern Europe at short notice in the wake of Russian aggression or other emergency situations. (Polish Armed Forces General Command/ via AP)
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