Polish Defense Minister Mariusz Blaszczak, left, and U.S. ambassador to Poland Paul Jones check the just signed deal to buy the U.S. made air defense Patriot system in Warsaw, Poland, Wednesday, March 28, 2018. Poland has signed a $4.75 billion deal with the United States to buy the Patriot missile systems as it seeks to bolster its defenses against a resurgent Russia. (AP Photo/Alik Keplicz)
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