NATO is stepping up its Arctic patrols. A key goal is getting eyes on Russian subs before they can disappear into deep water.

Fuente: Business Insider

NATO officials say there has been an uptick in Russian submarine activity in the North Atlantic in recent years. REUTERS/Tatiana MeelNATO has expanded its footprint in the North Atlantic in recent years, two Western officers said. This is partially in response to an increased presence of Russian submarines coming out of Murmansk.