Russia taking over the GIUK
gap 6 the maritime line between Greenland, Iceland, and the United Kingdom which was a defensive perimeter for NATO during the Cold War 6 would prove to be an obstacle for NATO forces to step in to help Norway in event of a conflict.
navy cold war ASW battle network was primarily defensive in nature, designed to prevent soviet submarines from penetrating the GIUK
The need increased in connection with the establishment of submarine surveillance along the GIUK
line (from Greenland, via Iceland, to the United Kingdom); in addition, Iceland became a key link in the North American Early Warning System.