Indian Strategic Studies: Hybrid air denial: The new gray zone battleground raging above Europe
AI Analysis
Recent drone incursions across multiple European nations (Denmark, Poland, Romania, Bulgaria, Latvia, Germany, Norway, Sweden) are indicative of a new tactic termed 'hybrid air denial,' utilizing low-cost drones to disrupt airspace and challenge sovereignty without triggering overt conflict. These incidents are prompting airspace closures and NATO responses, highlighting a growing vulnerability.
Key Takeaways
- Multiple European countries have experienced unidentified drone incursions in recent weeks.
- These incursions are being characterized as 'hybrid attacks' and a new form of 'hybrid air denial'.
- The tactic leverages the low cost, easy access, and minimal risk associated with drone operations.
- Incidents have disrupted civilian air travel (airport closures) and threatened military sites.
- NATO has been forced to scramble fighters to intercept drones, diverting resources and demonstrating a potential strain on air defense capabilities.
Why It Matters
This trend demonstrates a significant shift in air defense challenges, requiring a re-evaluation of existing air defense strategies and investment in counter-UAS technologies. The ability to disrupt critical infrastructure and sow uncertainty with relatively inexpensive drones presents a novel and escalating threat to European security and economic stability.
Indian Strategic Studies: Hybrid air denial: The new gray zone battleground raging above Europe
Maximilian K. Bremer and Kelly A. Grieco
Adversaries are leveraging drones to challenge national airspace and disrupt civilian and military air operations without triggering full-scale conflict, the authors of this op-ed argue. Here, a Polish soldier tests a drone software and simulator during Iron Defender 25 on Sept. 18 in Poland.
This week, Denmark imposed a nationwide ban on all civilian drone flights as European leaders gather in Copenhagen for the European Union Summit. The move follows repeated drone incursions in recent weeks, which Danish authorities have labeled“hybrid attacks,” after sightings of unidentified drones forced airport closures and threatened military sites.
Denmark is far from alone. In recent weeks, NATO fighters scrambled over Poland to intercept 19 Russian drones while another Russian drone loitered in Romanian airspace for nearly an hour. Debris washed ashore in Bulgaria and Latvia, and unidentified drones have also been reported over Germany’s Schleswig-Holstein region, Norway’s main airport, and near a Swedish naval base.
Far from isolated incidents, these incursions reveal a coordinated pattern in a new type of gray zone warfare — what we term “hybrid air denial” — that blurs the lines between peace and war. In this approach, adversaries use low-cost drones to access and deny commercial activity in the air littoral, producing outsized effects on security, the economy and public confidence.
Air denial has long been a wartime strategy, relying on fighter patrols, surface-to-air missiles or no-fly zones to contest control of the skies and prevent adversary air forces from operating freely over the battlefield. Recent conflicts, from Ukraine to Armenia-Azerbaijan and Gaza, show that drones, including low-cost systems operating in the air littoral, can extend this strategy to lower altitudes. Now, this approach is increasingly moving into the gray zone, with adversaries leveraging drones to challenge national airspace, test sovereignty and disrupt both civilian and military air operations without triggering full-scale conflict.
What makes drones especially effective for hybrid air denial is their combination of easy access, low cost and minimal perceived risk.