That activity, particularly the submarine component, has sparked concern about the vulnerability of undersea cables connecting the global economy.
NATO and the US have responded, bolstering forces at sea and anti-submarine warfare efforts and shifting NATO commands.
Russian undersea naval activity in the North Atlantic has reached new levels, and NATO is worried that the undersea cables connecting North America and Europe and the rest of the world are being targeted.
"Russia is clearly taking an interest in NATO and NATO nations' undersea infrastructure.".
Air Chief Marshal Stuart Peach, the UK's defense chief, has also sounded alarm about Russia's apparent focus on the undersea cables.
Lennon's and Peach's warnings are only the latest about Russian undersea activity in the vicinity of important underwater infrastructure.
US officials said in 2015 that increased Russia undersea activity could have been efforts to locate those cables. »
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