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Denmark has officially mobilized hundreds of military reservists due to a surge of unidentified drone activity over key military sites and airports.

Some shit you should know before you dig in: Over the last two weeks, Denmark has been repeatedly targeted by a wave of unidentified drone sightings over military bases and airports. Drones were observed at multiple high-security locations, including Skrydstrup Air Base, Karup Air Base (Denmark’s largest military facility), and near many civilian airports. At Karup, drones were reportedly seen both inside and outside the perimeter fence, leading to temporary airspace closures. Similar sightings shut down operations at airports across the country, including in Copenhagen, strandingthousands of passengers. Officials have not confirmed the origin of the drones but suspect they may be involved in surveillance or hybrid warfare, linked to foreign actors such as Russia.

What’s going on now: First reported by Danish news outlet TV 2, which obtained a confidential military notice, Denmark’s mobilization of hundreds of military reservists is linked directly to the surge in drone activity. The documents instructed reservists to report for duty as soon as possible, signaling heightened military preparedness ahead of this week’s high-level EU and European Political Community summits in Copenhagen. While the exact number of personnel remains undisclosed, sources suggest the scale involves several hundred individuals—many of whom are likely being positioned for domestic deployment to secure key infrastructure and bolster surveillance capabilities.

In tandem with the reservist activation, Danish authorities are coordinating with NATO and allied nations to strengthen regional airspace defenses. NATO has enhanced its presence in the Baltic Sea, deploying intelligence, surveillance, and reconnaissance (ISR) platforms along with at least one air-defense frigate. The United States has also flown ISR aircraft into the Baltic region, focusing on identifying potential drone launch origins (suspected to be within Russian proximity). Though official details about the drones remain limited due to operational security, sources suggest that the UAVs vary in size but are large and sophisticated enough to be picked up by military radar systems and justify full-scale counter-drone operations.

This all comes as allied nations have deployed advanced military assets and personnel to Denmark in a show of rapid coordination and collective defense against the escalating drone threat. Sweden has embedded specialized anti-drone units with Danish forces and temporarily transferred high-powered radar systems to assist in tracking and identifying aerial incursions. France has sent 35 military personnel, helicopters, and electronic warfare tools capable of detecting, jamming, or disabling drones. Germany has deployed the air-defense frigate FSG Hamburg to Copenhagen’s port and increased aerial monitoring operations near the Danish border, particularly in Schleswig-Holstein.