A United States military command aircraft, capable of communicating with nuclear-armed submarines, was tracked on an "unusual" flight near Greenland, according to an expert.

The U.S. Navy confirmed on Thursday the deployment of the E-6B airborne command post, also known as Mercury, at Pituffik Space Base in Greenland for what it described as "routine operations" and exercises with nuclear submarines in the Pacific and Atlantic Oceans.

"Naval Strategic Forces conduct global operations in coordination with combatant commands, services, and allies and partner nations, even in the High North," Commander Jason Fischer, U.S. Submarine Force spokesperson, said in a statement to Newsweek .

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