Visitors inspect a Russian army S-400 Triumf mobile anti-aircraft missile system at a display of military vehicles during Russian Navy day at the Vistula lagoon in Baltiysk, Russia, on Sunday, July 31, 2016. Amid Russia's recent rearmament, the Kaliningrad region has increasingly returned to its Soviet-era role as a garrison on the strategic Baltic Sea coast. Photographer: Andrey Rudakov/Bloomberg via Getty Images
