The one-off mission, titled "Allied Sky," is meant to signal the alliance's unity and improve interoperability, say U.S. military officials.
The carrier strike force was joined by an Air Force B-52 long-range bomber from Barksdale Air Force Base's 2nd Bomb Wing.
The B-52s took part in the end of the major BALTOPS maritime exercise, which takes place each year.
The flight took B-52s from Minot to the sea just off the northern coast of Siberia.
It's the latest in a string of long-range bomber flights to Europe this month to train with and bolster allies.
The Air Force sought to show it can deliver firepower around the world, even through mitigation efforts designed to limit the spread of coronavirus.
No injuries were reported.
While B-1B Lancer and B-2 Spirit have brought important capabilities, they will be phased out.
The Air Force previously deployed B-52s to Al Udeid Air Base in Qatar last May to deter Iranian aggression
The government said the plaintiff's radiation exposure was not enough to cause the illnesses he has since suffered.
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