“The recent U.S. promise to fund upgrades to Iceland’s military airfield at Keflavik is no diplomatic bone thrown to a small ally. The improvements will allow the U.S. Navy’s new P-8 Poseidon maritime patrol aircraft to keep an eye on Russia’s increasingly active and capable submarine force in a region whose importance is rising with the tensions between Moscow and the West. In short, the Greenland-Iceland-UK gap is back.”
Source: Russian Subs Are Reheating a Cold War Chokepoint – Defense One