Russian President Vladimir Putin (R) greets his Syrian counterpart Bashar al-Assad (L) during a meeting at the Kremlin in Moscow on October 20, 2015. (ALEXEY DRUZHININ/AFP/Getty Images)
A Standard Missile-6 demonstrating its ability to intercept ballistic missiles in their final seconds of flight during live fire tests July 28-Aug. 1, 2015, aboard the USS John Paul Jones. (Photo: Missile Defense Agency