The US Navy is returning to a Cold War submarine flash point, but the real action may be much farther northNOW WATCH: The Navy is building an autonomous underwater drone to hunt down enemy submarines See Also:After Trump's puzzling comments, a NATO ally is defending itself as a champion of freedom and stabilityTrump's sharp criticism of NATO's newest member has a point, but his comments are playing right into Russia's handsThe US Navy is returning to a Cold War submarine flash point, but the real action may be much farther northSEE ALSO: Submarines are increasingly lurking in seas around the world, and the US Navy's high-tech Poseidon is there to hunt them