GIUKGreenland-Iceland-United Kingdom
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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 gap.
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.