Drones have been seen near military facilities including Denmark's largest, following a series of incidents that caused air disruption earlier this week.
The devices were observed above Karup airbase, among others, forcing it to briefly close its airspace to commercial traffic. Possible sightings were also reported in Germany, Norway, and Lithuania.
This latest activity raises concerns about Denmark's vulnerability to aerial attack and has sparked fears of potential Russian involvement.
Danish authorities characterized Thursday's incursions as a 'hybrid attack', though they have no proof linking Moscow to the incidents.
The occurrence took place around 20:15 local time (18:15 GMT) and lasted several hours, with police stating they could not identify the drones' origins since they were not shot down. Cooperation with the Danish military is ongoing in the investigation.
While the civil airspace over Karup was temporarily closed, operations were not impacted, as no commercial flights were scheduled in the vicinity at the time.
Karup airbase employs around 3,500 personnel and hosts Denmark's military helicopters and airspace surveillance.
This drone activity follows several previous disruptions, with Copenhagen Airport and others temporarily halting operations due to similar sightings.
Authorities suspect these drone incursions might be part of a Russian strategy to undermine NATO states assisting Ukraine. The Russian embassy in Copenhagen dismissed claims of involvement as 'absurd'.
Denmark's defense minister described the 'hybrid attack' as being executed by a 'professional actor', indicating a local launch. Hybrid attacks blend military and non-military tactics to disrupt a nation's solid infrastructure.
With escalating tensions, the sighting of suspicious drones across various NATO countries has heightened oversight and defense readiness against such aerial threats.
