Intercepts of Ukrainian drones over Russian regions have become a daily occurrence, with Defense Ministry reports appearing so regularly that they have become a routine part of the news cycle. But destroying an incoming drone or cruise missile is only the final stage of a much longer process. Military Affairs examined how an interception actually works and why it begins well before an air-defense missile is launched.

The first challenge is detection. Once an airborne object is spotted, it must be tracked, its course established and an appropriate means of interception selected. Both ground-based air-defense systems and Russian Aerospace Forces aircraft can be involved in this process.

Small drones flying at low altitude are particularly difficult to detect, as are low-flying cruise missiles. Ground-based radars are constrained by the radar horizon, meaning the lower a target flies, the later it may become visible to a particular radar. Terrain, forests and urban development can further complicate detection.

Once a target is acquired, automated systems determine its coordinates, altitude, speed and direction. Successive measurements are used to build its track before the information is passed to forces capable of intercepting it.

Why Aircraft Patrol the Skies

Fighter aircraft provide an additional layer of defense. When a mass attack is expected, they can take off in advance and patrol designated areas while waiting for targets to appear or for targeting information.

Altitude gives aviation an important advantage. Airborne sensors are less constrained by the radar horizon than ground-based radars, allowing aircraft to expand the area in which low-flying targets can be detected.

After receiving information about an incoming drone, a fighter or attack helicopter, such as the Ka-52, can move into the interception area, acquire the target with onboard systems and engage it. This makes it possible to destroy some drones before they reach areas covered by ground-based air defenses.

Airborne early warning aircraft perform a different role. Russia’s A-50, for example, is primarily designed to monitor the airspace. Operating at altitudes of around 10–11 kilometers, it can detect and track airborne objects and relay information to forces on the ground.

Aircraft patrolling during an expected raid therefore form a mobile airborne layer that supplements ground-based air defenses.

When Ground-Based Air Defense Takes Over

If a drone is not intercepted by aviation, ground-based systems can engage it. Russia uses systems including the Tor-M2 and the Pantsir family for the direct protection of important areas and facilities.

Once target data is received, the air-defense system begins tracking the object and calculates the parameters required for interception. The missile is not simply launched in pursuit of the drone. It must be guided toward a calculated point where its trajectory will intersect with that of the moving target.

A direct collision is not always necessary. Many surface-to-air missiles carry fragmentation warheads that detonate near the target. The resulting fragments can damage the airframe, engine, control system or other critical components of a drone or cruise missile.

The result of the engagement must then be assessed. If the target is damaged but remains airborne, another air-defense element can engage it.

Missiles Are Not the Only Option

Using a full-size surface-to-air missile against every small drone is expensive and not always practical. Counter-drone defenses therefore rely on several different methods.

Alongside missiles and aircraft, defenders can employ automatic cannons, machine guns, specialized interceptor drones and electronic warfare systems.

Electronic warfare works differently from conventional weapons because it does not necessarily destroy the drone. Instead, it can interfere with communication links or satellite navigation. Its effectiveness depends on the design of the particular UAV. A drone equipped with autonomous navigation may be able to continue toward its target even after losing contact with its operator.

Why Mass Drone Attacks Are More Difficult

A large-scale raid creates a much more demanding problem than a single incoming drone. The difficulty comes not only from the number of targets. UAVs can approach along different routes, fly at different altitudes and arrive from several directions.

Air defenses must track multiple objects simultaneously, assign them to available weapons and determine the order in which they should be engaged. Every air-defense system also has a finite ready ammunition load and requires time to reload.

This is why the defense is organized in layers. Aircraft can intercept some targets farther out, ground-based missile systems engage others, while short-range defenses protect important facilities from drones that penetrate the outer layers.

Drone interception is therefore a chain of interconnected actions: detection, tracking, classification, target assignment, airborne or ground-based engagement, and confirmation of destruction. The earlier an incoming UAV is detected and the faster this sequence is completed, the more time defenders have to destroy it before it reaches its target.