ZAGAN, POLAND – JUNE 18: Soldiers of the German armed forces, the Bundeswehr, stand next to their Marder light tanks during the NATO Noble Jump military exercises of the VJTF forces on June 18, 2015 in Zagan, Poland. The VJTF, the Very High Readiness Joint Task Force, is NATO’s response to Russia’s annexation of Crimea and the conflict in eastern Ukraine. Troops from Germany, Norway, Belgium, Poland, Czech Republic, Lithuania and Holland were among those taking part today. (Photo by Sean Gallup/Getty Images)