Denmark Says New Drone Flights Over Military Base, Airports Are ‘Hybrid Attack’
Drones were spotted over at least four airports, including a military air base housing most of Denmark’s F-16 and F-35 jet fighters
By
Sune Engel Rasmussen
Sept. 25, 2025 6:49 am ET
Denmark’s Aalborg Airport was closed for a few hours on Wednesday following a drone incident. Photo: bo amstrup/Agence France-Presse/Getty Images
Drones were observed over Danish airports, including a military air base, marking the second such incident in less than a week. Denmark said it had suffered a hybrid attack by a professional actor after drones were observed over several airports late on Wednesday, the
second time in less than a week that unmanned aircraft have disrupted air traffic in the Nordic nation, a NATO member.
Drones were spotted over at least four airports in the western part of the country, including a military air base housing most of Denmark’s F-16 and F-35 jet fighters. The Danish government said it considered calling for consultations under the North Atlantic Treaty Organization’s Article 4, under which member states can raise issues of national security concern for discussion within the North Atlantic Council.
“We currently don’t know who is behind it. But everything suggests that it is a professional actor, given that it is such a systematic operation against so many locations, practically simultaneously,” Danish Defense Minister Troels Lund Poulsen said Thursday.
He added there was currently no evidence linking the drone activity to Russia, and the unmanned aerial vehicles didn’t pose a military threat to Denmark. Poulsen said the UAVs were launched from Denmark’s vicinity, “not from far away,” and said Denmark needs to improve its drone-detection abilities, possibly with help from Ukraine.
Drones spotted over Danish and Norwegian airports
Source: staff reports Daniel Kiss/WSJ
“This is what I would define as a hybrid attack with different types of drones. These are actions that could endanger our safety and freedom,” Poulsen said. “I understand the concern among the Danish people, but we cannot today present a solution that removes the threat from drones.”
Hybrid warfare usually describes the use of a mix of conventional and unconventional tools—such as nonlethal technology—to inflict damage on an adversary, often without leaving clear evidence of who was responsible. Denmark’s police and military are still investigating drone sightings that forced airports in Copenhagen and Oslo to close for several hours late Monday, which the Danish prime minister called the most serious action to date against the country’s critical infrastructure.
The drone incidents in Denmark are the latest in a string of disruptions to the airspace of European NATO members, some of which have been blamed on Russia.
Danish officials held a press conference in Copenhagen on Thursday. Photo: emil helms/epa/shutterstock/Shutterstock
NATO jet fighters last week
intercepted Russian warplanes that violated Estonia’s airspace for 12 minutes. Earlier this month, NATO radar and warplanes
engaged some of the 19 Russian drones that flew deep into Polish airspace. Both nations called for consultations under NATO’s Article 4, as Copenhagen is now considering doing.
President Trump this week said NATO allies should shoot down Russian planes that violate alliance members’ airspace.
Also last week, cyberattacks hit check-in and boarding systems at four of Europe’s main airports, including Berlin, Brussels, Dublin and London’s Heathrow, causing
days of flight cancellations and delays. Wednesday’s drone incidents in Denmark occurred over airports in Aalborg, which was closed for a few hours, Esbjerg and Sønderborg, as well as Fighter Wing Skrydstrup, an air base of the Royal Danish Air Force. The drones were similar to the ones spotted in Copenhagen earlier in the week, shining lights that were visible from near the airports, police said.
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Drones Close Denmark’s Airspace for Second Time
“Let me be completely clear: The aim of this type of hybrid attack is to create fear. It is to sow division and to frighten us,” Danish Justice Minister Peter Hummelgaard said. Danish armed forces refrained from downing the drones, because of concern for the safety of citizens on the ground, the country’s defense chief, Michael Hyldgaard, said. He characterized the recent drone activity as “actual operations.”
The Danish government said it would expedite a law, which has been in the works for two years, giving airports more authority to shoot down drones. Danish police said it had raised its crisis preparedness to the highest level since a string of terrorist attacks across Europe in 2015.