The Threat Spectrum: Who Defeats What? Counter-Drone Authority as Threats Escalate

The first part of this series looked at how drone incident response changes as a site moves from peacetime to crisis to war. But the operational state is only one dimension. The other is the threat itself.

A civilian airport at peace can still face a drone that only an air defence system could stop. And in a crisis, civilian operators may be expected to deal with threats that, until recently, nobody outside the military was asked to confront.

So the question every operator eventually asks is a practical one: where does our responsibility end, and the military's begin?

Counter-Drone Authority: A Spectrum, Not a Switch

Defence planners have long described this in terms of a "transition to war": the stages between full peace and total war, with threat levels and government intervention rising at each step. At the far end, a nation's assets and legislative powers are fully committed to its defence.

Europe is not at war. But state-sponsored activity on its territory is pushing threat levels up the scale. The explosive-laden drone found at Leipzig/Halle in August, which Germany has attributed to Russia, was a clear step: a weaponised drone in a civilian environment, something Western Europe had rarely, if ever, seen.

Every step up that scale changes who is expected to act, and with what.

Civil vs Military Counter-Drone Authority: Where the Line Falls

In practice, judgement often matters more than law when deciding whether civilians or the military should respond. The decision depends on how fast the threat is, how well-protected it is, and how difficult it is to defeat.

At the top end sit Shahed-type one-way attack drones and their Russian-built Geran variants. They are large, fast, and getting faster: newer jet-powered versions fly roughly twice as fast as the earlier propeller-driven models, making them far harder for interceptor drones to catch.

Among critical infrastructure operators, the consensus is clear. Civilian systems should detect and report these threats, but defeating them is an air defence task. A jammer or a non-weaponised interceptor is not designed for that fight.

Below that sits most of what NATO classifies as Class I unmanned aircraft: drones with a maximum take-off weight under 150 kg. This is the core counter-UAS target set, where dual-use systems operated by police, security services or home guard forces are expected to protect critical sites.

At the lower end are small, improvised weaponised drones, like the one at Leipzig. These are increasingly seen as the responsibility of the civilian administration: the site operator, local police and civil security forces.

A Grey Zone Without Precedent

This is genuinely new territory. For most of modern history, a country was either at war or it wasn't, and the response either involved military firepower or it didn't. Beyond armed police responding to terrorism, civilian security teams were never expected to engage targets in the sky.

Now they may be. The threat has moved into a grey zone where the size and capability of a drone, not just the state of the nation, decide who acts.

That makes clear, pre-agreed thresholds essential. Without them, the first serious incident becomes the moment a site discovers where its responsibility really ends.

Counter-Drone Authority for Civilian Operators

Regulators are starting to respond. Across Western Europe, there is growing discussion about delegating more defeat permissions to authorised civilian operators, not only the police. That could include jammers, cyber-based defeat systems and non-weaponised interceptor drones.

The EU Action Plan on Drone and Counter Drone Security points in the same direction, upgrading training for law enforcement operators to include mitigation and neutralisation, and calling for a multi-layered, multi-effector approach to protecting critical infrastructure.

Delegation brings its own requirements: clear rules on who may act against which threat, trained and certified operators, and an auditable record of every decision. It also needs a command layer that can apply different rules to different threats at the same time.

From Site to Nation: Counter-Drone Authority at Scale

The most significant shift is architectural. Homeland counter-drone systems are increasingly designed to integrate with police and military forces. This allows a response to scale from a single site to full air defence.

Denmark's nationwide counter-drone programme is a clear example. It connects civilian sites and different law enforcement agencies into a single national picture, linked to the military air picture. When a threat crosses the line from a civil to a military problem, the track does not need to be handed over by phone. It is already there.

That kind of scaling depends on open, standards-based interfaces, such as the SAPIENT standard for counter-drone sensors and effectors, and on command and control that can exchange tracks with air defence networks.

Built for Every Threshold

For operators, the lesson is to agree counter-drone authority across the full range of threats, not only the ones they are expected to defeat. A site should be able to detect and report what it cannot stop, act within its delegated authority on what it can, and hand over seamlessly when a threat escalates beyond it.

Thresholds will keep moving as regulation evolves and threats get faster. The architecture underneath has to move with them.