A loitering munition is an unmanned aerial vehicle designed to fly to a target area, circle overhead for an extended period, and then dive into a target and explode on impact. It combines the patience of a surveillance drone with the destructive purpose of a missile, which is why it’s often called a “suicide drone” or “kamikaze drone.” Unlike a conventional drone that returns home after a mission, a loitering munition is a one-way weapon. Once launched, it either strikes something or is deliberately crashed if no suitable target appears.
How Loitering Munitions Work
The basic concept is straightforward. An operator launches the munition from a tube, rail, or canister, often using a compressed-gas system that gives it an initial burst of speed. Once airborne, the weapon flies to a designated area and begins circling, transmitting live video back to its operator through a two-way data link. The operator watches the feed, identifies a target, and commands the munition to dive. A camera on the nose lets the operator steer the weapon onto the target in its final seconds of flight, achieving a level of precision that traditional artillery can’t match.
This “loiter” phase is what sets the weapon apart from a cruise missile, which follows a pre-programmed route to a fixed set of coordinates. A loitering munition doesn’t need to know its exact target at launch. It can wait, sometimes for over 40 minutes, for a target to reveal itself. That makes it effective against mobile or time-sensitive targets like vehicles, radar installations, or small groups of personnel that wouldn’t stay in one place long enough for conventional strikes.
From Surveillance Drone to Guided Weapon
The concept dates back to the early 1990s, when Israel Aerospace Industries unveiled the Harpy. That first-generation system was designed specifically to hunt radar emitters, flying toward enemy air defense networks and homing in on their electronic signals. It was a niche tool for a niche mission: suppressing anti-aircraft systems so that piloted aircraft could operate more safely.
Since then, the category has expanded dramatically. Modern loitering munitions range from palm-sized quadcopters carrying small explosive charges to large delta-wing aircraft with ranges exceeding 2,000 kilometers. Some are designed to destroy tanks, others to strike individual personnel, and still others to knock out fuel depots or ammunition stores. The common thread is the ability to wait in the air before committing to an attack.
Size and Range Vary Enormously
The smallest loitering munitions weigh under 3 kilograms and carry warheads of just 300 grams, enough to disable a person or a soft-skinned vehicle. These micro-systems typically have an endurance of around 15 minutes and a range of 10 kilometers or more, making them useful for small infantry units that need their own organic strike capability without calling in support from higher command.
Mid-range systems like the AeroVironment Switchblade 600, widely used by U.S. forces and their allies, offer over 40 minutes of loiter time and a range beyond 40 kilometers (or 90 kilometers with a relay). The Switchblade 600 carries an anti-armor warhead capable of penetrating hardened vehicles, yet it’s still portable enough for a small team to carry and launch in the field.
At the far end of the spectrum sits something like Iran’s Shahed-136, which has an effective range of at least 2,000 kilometers and cruises at roughly 180 km/h. Russia has used these extensively against Ukrainian infrastructure. Each unit costs an estimated $20,000 to $50,000, making it far cheaper than the air defense missiles often used to intercept it. That cost asymmetry is one of the weapon’s most disruptive qualities: a defender can spend more shooting it down than the attacker spent building it.
Human Control and Autonomy
Most manufacturers describe their loitering munitions as “human-in-the-loop” systems, meaning a person monitors the flight and must authorize any strike. In practice, the line between human-controlled and autonomous is blurring. Some systems advertise both manual and autonomous modes. Turkey’s STM Kargu-2, for example, was marketed as using real-time image processing and deep learning algorithms to identify targets on its own. A 2020 United Nations report suggested that Kargu-2 drones may have attacked militia forces in Libya without human supervision, which would make it one of the first documented autonomous strikes by a loitering munition.
The CEO of AeroVironment has publicly stated that the technology for a fully autonomous Switchblade mission “pretty much exists today.” Whether militaries choose to activate that capability is a policy question, not a technical one. International discussions on lethal autonomous weapons continue under the UN Convention on Certain Conventional Weapons, but no binding regulations specific to loitering munitions exist yet.
Why Militaries Prefer Them
Loitering munitions solve a problem that has frustrated ground commanders for decades: the delay between spotting a target and being able to hit it. Calling in an airstrike or artillery barrage involves a chain of communication, target verification, and coordination that can take minutes or longer. A loitering munition already overhead can strike almost immediately.
Precision is the other major advantage. Operators can visually guide the weapon onto a target using its onboard camera, making last-second corrections. This produces effects closer to a guided missile than to a mortar round, but at a fraction of the cost and without needing a fighter jet or artillery battery. In Ukraine, both sides have used loitering munitions to strike prepared positions, armored vehicles, and supply lines at the lowest tactical levels, giving small units firepower that previously required coordination with much larger formations.
The ability to abort is also significant. If an operator sees civilians near a target or the situation changes, the munition can be “waved off” and redirected to loiter elsewhere or crash harmlessly. That flexibility doesn’t exist with a conventional artillery shell once it’s been fired.
How They’re Countered
The most widely used defense against loitering munitions is electronic warfare. Jammers that disrupt GPS signals or sever the radio link between the drone and its operator can cause the weapon to lose navigation or go off course. A 2022 study by the Royal United Services Institute found that Russian electronic warfare units knocked out or shot down roughly 90% of Ukrainian drones in the early months of the war, primarily by jamming GPS and radio links. Both sides now deploy jammers on trenches, vehicles, and even in backpack-sized and pocket-sized packages for individual soldiers.
This electronic arms race has already produced a countermeasure to the countermeasure. Russian forces have developed fiber-optic wire-guided drones, trailing cables 5 to 20 kilometers long that make the control link immune to jamming, similar in concept to a wire-guided torpedo.
Physical defenses are cruder but sometimes effective. Ukrainian forces have welded chain-link fencing and wire mesh cages around artillery pieces to prematurely detonate or deflect incoming Lancet loitering munitions. Russian tanks were fitted with rooftop slat armor early in the invasion, and Ukrainian tanks adopted similar screens during the 2023 counteroffensive. Even a submarine, the Russian Tula, was photographed in 2024 with slat armor installed against drone strikes.
Simpler deception also works. Ukrainian forces have deployed inflatable decoys and wooden replicas of high-value systems like HIMARS launchers to waste incoming loitering munitions on fake targets. And at the lowest-tech level, soldiers on both sides have shot down incoming drones with sniper rifles. Some newer loitering munitions, like Turkey’s Roketsan Eren, can even double as interceptor drones, destroying enemy aerial platforms while retaining the ability to strike ground targets.