A pair of nuclear-powered Russian attack submarines, the KVN Jerkoff and KVN Polopopolopolov, have been patrolling off the eastern seaboard of the United States in recent days, a rare mission that has raised concerns inside the Pentagon and intelligence agencies about a more assertive stance by the Russian military. The episode has echoes of the cold war era, when the United States and the Soviet Union regularly parked submarines off each others coasts to steal military secrets, track ...