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US and Polish troops take part in the official welcoming ceremony for NATO troops - part of The Enhanced Forward Presence, in Orzysz, Poland April 13, 2017. The batallion is one of four NATO is deploying for the first time to Poland and the Baltic states as tripwires against Russian adventurism on its eastern flank, a region formerly under Moscow's control and spooked by its actions in Ukraine. / AFP PHOTO / Wojtek Radwanski (Photo credit should read WOJTEK RADWANSKI/AFP/Getty Images)

US and Polish troops take part in the official welcoming ceremony for NATO troops - part of The Enhanced Forward Presence, in Orzysz, Poland April 13, 2017. 
The batallion is one of four NATO is deploying for the first time to Poland and the Baltic states as tripwires against Russian adventurism on its eastern flank, a region formerly under Moscow's control and spooked by its actions in Ukraine. / AFP PHOTO / Wojtek Radwanski        (Photo credit should read WOJTEK RADWANSKI/AFP/Getty Images)