Hybrid Warfare: Europe Grapples with Surge in Drone Intrusions

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uropean leaders are sounding the alarm after a sudden surge in unmanned aerial vehicle (UAV) incursions across the continent, raising fears that what was once a nuisance has escalated into a strategic campaign of “hybrid warfare.”

European Commission President Ursula von der Leyen warned lawmakers on Wednesday that the recent wave of drone overflights targeting airports, power plants, and defense facilities marked “something new and dangerous” in Europe’s security landscape.

“In just the past two weeks, MiG fighters have violated Estonia’s airspace, and drones have flown over critical sites in Belgium, Poland, Romania, Denmark, and Germany,” she said in a fiery speech before the European Parliament in Strasbourg. “Flights have been grounded, jets scrambled, and countermeasures deployed to ensure the safety of our citizens. Make no mistake. This is part of a worrying pattern of growing threats.”

The European Parliament is preparing a resolution this week describing the incidents as “acts of hybrid warfare” and citing possible involvement by “Russian agents” in coordinated drone operations meant to sow disruption and fear across the bloc.

From nuisance to threat

For years, European air safety agencies have been dealing with small drones straying into flight paths — mostly by accident. But the recent surge in mysterious and deliberate incursions has pushed governments into crisis mode.

Airport authorities in Denmark, Norway, and Germany were forced to close airspace temporarily after UAVs of unknown origin were spotted over runways. In Belgium, a defense contractor producing missile systems reported a “worrying increase” in unidentified drone sightings near its facilities.

“One incident may be a mistake. Two, a coincidence. But three, five, ten? This is a deliberate and targeted gray zone campaign against Europe. And Europe must respond,” von der Leyen declared.

While Russian involvement is suspected in several cases — particularly after Russian military drones briefly crossed into Poland and Romania — analysts caution that not every incident bears Moscow’s fingerprints.

“Some of these intrusions may be testing Europe’s defenses; others could be unrelated,” said Sander Starreveld, director of the aviation consultancy SIG Aviation. “But the pattern is concerning because it shows how easily drones can bypass conventional security systems.”

Drones are hard to see — and stop

According to the EU Aviation Safety Agency (EASA), the number of reported drone-related incidents in European airspace jumped from about 500 in 2015 to nearly 2,000 in 2019 — and experts believe the true number is much higher today.

“Air traffic control systems are generally unable to detect small drones,” said Frédéric Deleau, vice president for Europe of the International Federation of Air Traffic Controllers’ Associations. “Traditional radar is optimized for large aircraft, not lightweight carbon-fiber drones that can easily evade detection or appear as birds.”

To counter the growing threat, major airports across Europe have deployed specialized anti-drone technologies — including radar, radio-frequency scanners, acoustic sensors, and high-resolution cameras. But none offer complete protection.

“No single technology yet provides reliable coverage,” Deleau admitted. “The cat-and-mouse dynamic continues — as soon as one detection method improves, drone technology adapts.”

From hobbyists to hostile actors

For much of the last decade, unauthorized drone flights near airports were attributed to recreational users unaware of flight restrictions.

“Until recently, the main issue was that the average drone operator simply didn’t know where drones were permitted to fly,” Starreveld said. “You’d buy one, fly it near an airport, and call yourself a ‘pilot.’ Curiosity and carelessness were the main problems.”

That changed as regulators imposed stricter rules, awareness campaigns, and geofencing software that automatically prevents consumer drones from entering restricted areas. But the recent spate of incidents — many involving multiple UAVs operating in formation — appears to be intentional interference.

“What’s new in these incidents is the deliberate use of drones to disrupt air traffic,” Starreveld explained. “For airline pilots, that idea alone places these encounters in a completely different and deeply worrying category: criminal or strategic intent.”

Security experts describe these drone incursions as part of a “gray-zone” conflict — actions that fall short of open warfare but still seek to weaken, intimidate, or test an adversary.

“Russia, China, and even smaller actors understand the value of ambiguity,” said Dr. Helena Braun, a senior fellow at the European Security Centre in The Hague. “If you can cause chaos at a European airport without firing a shot, you demonstrate vulnerability and consume resources.”

Von der Leyen has called for a “European Drone Shield” — a continent-wide system integrating surveillance, intelligence sharing, and electronic countermeasures to neutralize UAVs before they threaten safety or infrastructure.

The proposal, modeled loosely on NATO’s air defense systems, would involve closer coordination between national air forces, intelligence agencies, and civilian aviation authorities.

But some EU diplomats worry the plan could take years to implement. “The pace of drone innovation is far faster than the EU’s policymaking process,” said one senior official familiar with the talks.