Often overshadowed by the ongoing discussion of the relentless growth and rapid evolution of China’s navy, another dangerous and unpredictable potential threat stirs in the East. From the ashes of the Soviet Union’s mighty fleet of nuclear submarines, Russia has embarked on an aggressive effort to resurrect its undersea-warfare capabilities. Although much has changed since the glory days of perilous cat-and-mouse adventures between U.S. and Soviet submarines, Russia has unfortunately rekindled some of the aggressive nationalism reminiscent of the Cold War. As increasingly vitriolic rhetoric flows despite President Barack Obama’s repeated overtures of friendship, Moscow’s intentions are particularly troubling considering its recent rush to claim newly accessible resources laid bare by the receding Arctic ice sheet.