A wave of coordinated drone incursions forced the closure of five airports across Denmark late Wednesday into Thursday morning, in what authorities are calling the country’s most serious attack on critical infrastructure to date. The incidents—described by Danish officials as a “systematic hybrid attack” carried out by a professional actor—marked the second disruption to the nation’s airspace in under a week and have triggered alarm across NATO.
The affected airports—Aalborg, Billund, Esbjerg, Sønderborg, and Skrydstrup—were temporarily shut down after drones were detected hovering in restricted airspace. Authorities first sighted the unmanned aerial vehicles, reportedly equipped with green lights, over Aalborg Airport at 21:44 local time. Within hours, additional sightings forced Billund, Denmark’s second-largest international airport, to suspend operations. Both Aalborg and Skrydstrup are also home to military airbases, amplifying national security concerns.
Danish Defence Minister Troels Lund Poulsen told reporters the incursions were “not random” and bore the hallmarks of a well-coordinated intelligence-gathering operation. “We are treating this as a hybrid attack,” he said, adding that while there was no direct evidence linking Russia, the level of sophistication “points to a professional actor.”
Prime Minister Mette Frederiksen called the drone operation “the most severe attack on Danish infrastructure we have seen so far,” and did not rule out potential involvement from hostile foreign states. The remarks come as NATO allies brace for escalating threats across Europe’s eastern flank.
The Kremlin swiftly dismissed suspicions, calling them “absurd provocations.” However, the timing of the incursions—just days after Russian drones violated airspace in Poland, Estonia, and Romania—has further intensified fears of a creeping Russian hybrid campaign across NATO territory.
The drone flights led to diverted aircraft and stranded passengers. Airspace reopened by 03:00, but the chaos renewed scrutiny over European preparedness for drone threats. Police confirmed they could have shot down the drones but chose restraint due to public safety concerns.
“We have the technical ability, and if we get the opportunity, we will take them down,” said Chief Inspector Jesper Bøjgaard Madsen. Authorities have urged the public to steer clear of affected zones and remain vigilant.
The episode has reverberated beyond Denmark. NATO Secretary-General Mark Rutte reiterated that the alliance “will use all necessary tools” to defend its members. Meanwhile, U.S. President Donald Trump recently encouraged NATO allies to “start shooting down Russian aircraft” that breach their borders.
European Commission President Ursula von der Leyen has proposed the creation of a “drone wall”—a continent-wide system to detect and neutralize unmanned threats—currently under debate among EU nations.
Justice Minister Peter Hummelgaard echoed growing sentiment, warning that “hybrid threats are here to stay,” and urged Europe to develop a unified defence strategy to counter emerging risks.
Denmark has called for an emergency EU security meeting on Friday. Defence Minister Poulsen said he would present the Aalborg and Billund incidents as “evidence of Europe’s growing vulnerability to asymmetric threats.”
“This was no amateur stunt,” Poulsen declared. “This was coordinated, calculated, and designed to test our readiness—both in Denmark and across the alliance.”
