The NATO exercise, Trident Juncture, concluded Sunday and involved some 50,000 personnel. It was labeled the alliance's largest exercise since the Cold War. Non-NATO members Finland and Sweden also participated in the exercise.
A spokesperson for the Norwegian ministry of defense acknowledged the jamming to CNN, which it said took place between October 16 and November 7, and said it would defer to the Ministry of Foreign Affairs on further questions to Russian authorities.
"Norway has determined that Russia was responsible for jamming GPS signals in the Kola Peninsula during Exercise Trident Juncture. Finland has expressed concern over possible jamming in Lapland," NATO spokesperson Oana Lungescu told CNN Wednesday.