Norway watches as Russian subs and aircraft step up Arctic patrols

NATO ally Norway has announced that it is boosting the number of naval patrols near vital undersea gas pipelines off its coast, and released a trove of videos exclusively to NBC News illustrating what it sees as a growing Russian threat in the Arctic.

The videos provided by the Royal Norwegian Air Force capture the high-stakes cat-and-mouse game between the two militaries, with Russian attack submarines patrolling near a maze of undersea pipelines carrying vast amounts of natural gas to Europe and telecommunication cables linking Europe and America.