Denmark is one of the five NATO founding members that are Arctic states

Background

Denmark, which hosted the NATO Military Committee Conference in Copenhagen, is one of the Alliance's Arctic Allies.
NATO states that five of its founding members - Canada, Denmark, Iceland, Norway and the United States - are Arctic states.
Seven of the eight Arctic states are now members of NATO, after Finland and Sweden joined the Alliance.
The Nordic Allies Denmark, Finland and Sweden were added to the area of responsibility of Joint Force Command Norfolk.
NATO's Arctic activity Arctic Sentry includes national exercises, among them Denmark's Arctic Endurance series of exercises.
NATO describes the Arctic and the High North as a region where it must strengthen awareness and presence.