Cheap Drones Are Changing War

Drones have moved from the margins of warfare to its center. The war in Ukraine is the decisive evidence. Small flying machines costing only a few hundred dollars find the enemy, serve as the eyes of artillery, and crash directly into tanks. Militaries around the world are rewriting their doctrine.

Eyes in the Sky, Suicide Attackers and Long-Range Strikers

Drones fall into three broad roles.

The first is the eye in the sky. Small quadcopters such as the DJI Mavic fly above units and send back live video. Larger high-altitude reconnaissance aircraft watch broad areas from thousands of meters up. Their job is not to shoot but to see the battlefield precisely.

The second is the self-destructing attacker. A first-person-view, or FPV, drone is a small quadcopter flown by a pilot wearing goggles, carrying a warhead on its body and flying straight into its target. A loitering munition circles above a target area and dives onto an enemy once one is found. Russia’s Lancet and America’s Switchblade are examples.

The third is the long-range one-way attack drone. The Shahed-136, designed by Iran, and Russia’s Geran fly hundreds of kilometers to strike cities and infrastructure. Each costs tens of thousands of dollars. They are disposable weapons, with no fuel or pilot for a return trip.

The change has spread from the air to the sea. Ukraine’s uncrewed surface vessels, or USVs, carried explosives into Russian warships and inflicted heavy damage, eventually pushing much of the Black Sea Fleet east from its base at Sevastopol.

Three Wars Showed the Spread of Drones

Drones have not stayed in one theater. They spread quickly from conventional war to irregular war, and from the air to the sea.

It began with the 2020 Nagorno-Karabakh war. Azerbaijan’s Bayraktar TB2 drones and Harop loitering munitions disabled Armenian tanks and air defenses, and the power of drones became widely known.

The war in Ukraine raised the scale to another level. Ukraine set a goal of producing one million FPV drones in 2024 alone, and Russia built a mass-production system of its own. Drones are now everyday basic weapons on the battlefield, alongside artillery.

Then, in the Red Sea crisis, Houthi rebels threatened merchant ships with drones and missiles, shaking global shipping lanes. It proved that drones are not the exclusive property of regular armies, and that their value as an asymmetric weapon is real.

Why the Balance Shifted

The first reason is the imbalance of cost. A drone costing a few hundred dollars stops a tank costing millions. Using an expensive air-defense missile worth millions, such as the Patriot, to shoot down a cheap drone leaves the defender decisively worse off in the exchange.

The second is the transparency of the battlefield. With the sky under constant surveillance, a large troop concentration is detected at once and leads to a strike. Forces are dispersing more, and traditional camouflage, deception and trench warfare have become important again.

The third is the speed of strikes. As drones detect an enemy and strike at once, the kill chain from detection to strike has shrunk sharply, to a matter of minutes.

Countermeasures Are Evolving

As drones grew stronger, the technology to counter them evolved quickly as well.

Early countermeasures centered on electronic warfare. Jamming control signals and signals from the Global Positioning System, the satellite network that fixes position, disables drones.

Then came fiber-optic drones. They pay out a thin fiber-optic cable as they fly, exchanging control signals through it, and are unaffected by electronic warfare. Russia and Ukraine have used fiber-optic FPV drones in combat since 2024.

Interceptor drones have also appeared. A fast drone rams an enemy drone and knocks it down. Layered defenses combining guns, lasers and electronic warfare equipment are under discussion.

Autonomy is also advancing fast. Artificial intelligence identifies targets and guides a drone to the final moment on its own. It is an attempt to complete a strike even when radio links are cut by electronic warfare.

How Future Wars Will Change

First, mass and autonomy become the core weapon. Swarm drones operating in groups of dozens or hundreds are under development, along with collaborative combat aircraft, or CCA, flying alongside piloted fighter jets.

Second is the redesign of air defense. Expensive missiles alone cannot cope, so combined defenses fusing cheap interceptor drones, lasers and electronic warfare are becoming essential.

Third, industrial output becomes war-fighting capacity. Because drones can be built from commercial parts, rapid mass production and secure supply chains determine how long a war can be sustained.

Fourth is the change in ground doctrine. Tanks are not disappearing, but they are evolving into forms fitted with active protection systems, or APS, drone screens and electronic warfare equipment, while infantry disperses further and even rear supply routes fall within drone range.

Fifth is the shaking of sea power. Uncrewed surface vessels and underwater drones threaten the traditional naval dominance built around large warships.

Sixth are the problems of proliferation and ethics. Even non-state groups now hold long-range precision strike capabilities, and the debate continues over the legal and ethical questions of artificial intelligence making lethal decisions.

Revolution or Evolution

Experts disagree. One side sees drones as a revolution that changed the nature of war. The other sees only the evolution of precision firepower and reconnaissance technology, and argues that industrial capacity and combined-arms operations ultimately decide victory and defeat.

What is clear is that a modern war without drones is now hard to imagine. The question is not whether a military has drones, but how many, how fast and how smartly it operates them.