Iran’s low-cost Shahed drones — sometimes costing no more than a small car — are increasingly exposing a major weakness in the world’s most sophisticated air-defence systems. In recent attacks across the Gulf region, relatively crude drones priced around $20,000–$50,000 have forced militaries to fire interceptor missiles worth millions of dollars, creating a striking imbalance between the cost of attack and the cost of defence.
Defence analysts say the drones’ design, flight profile and swarm tactics make them unusually difficult to stop, even for advanced radar and missile systems built to counter fast-moving ballistic threats.
The weapon at the centre of the debate is the Shahed series of Iranian attack drones, which have become one of the most widely used loitering munitions in modern conflicts.
Roughly 10 feet long with an eight-foot wingspan, the drone carries explosives in its nose and detonates when it strikes a target. Once programmed with coordinates, it can travel hundreds of miles autonomously.
Despite its simplicity, the drone’s most powerful advantage is its flight behaviour.
Shahed drones fly relatively slowly compared with missiles.
They operate at low altitudes.
They produce a radar signature similar to birds or small civilian aircraft.
Most modern air-defence radar systems are designed to detect fast, high-altitude threats such as ballistic missiles or fighter jets. Radar software often filters out slow-moving objects to avoid false alarms from birds or small planes.
As a result, drones flying slowly and close to the ground can slip through detection systems until they are dangerously close to their targets.
Even when the radar settings are adjusted to capture such objects, the system may be flooded with false signals, complicating efforts to identify genuine threats.
The economic imbalance created by these drones is becoming a major concern for militaries.
Each Shahed drone is estimated to cost roughly $35,000, yet intercepting it often requires sophisticated surface-to-air missiles costing up to $3 million each.
That cost gap becomes even more problematic when drones are launched in large numbers.
Attackers can deploy drones in swarms.
Defenders must intercept nearly every incoming drone.
Even a few that slip through can cause significant damage.
This “cost asymmetry” allows relatively inexpensive drones to overwhelm sophisticated defence systems designed for entirely different threats.
Defence analysts say the tactic is particularly effective against high-value targets such as airports, oil facilities, government buildings and data centres.
Military experts say cheap attack drones are reshaping battlefield strategy. Because the systems are inexpensive and relatively simple to manufacture, countries can produce them in large numbers and launch coordinated swarm attacks that saturate air-defence networks.
“They’re designed to wreak havoc,” defence analyst Anna Miskelley of Forecast International told The New York Times. The dramatic explosions captured in videos also amplify the psychological and media impact of such attacks.
This combination of low cost, high visibility and destructive potential has made loitering drones a powerful weapon in modern hybrid warfare.
Instead of relying solely on defensive solutions, the United States military has also begun developing similar low-cost drones.
American researchers initially studied captured Shahed drones as part of counter-drone programmes, but the effort eventually evolved into a plan to replicate the concept.
The result is a new system known as the Low-Cost Unmanned Combat Aerial System, or LUCAS.
Developed by the Arizona-based defence start-up SpektreWorks, the drone is designed to deliver similar capabilities at a fraction of the cost of traditional cruise missiles.
Officials say the key breakthrough was speed of development. The system was reportedly designed, tested and fielded in roughly 18 months.
At an estimated cost comparable to Shahed drones, LUCAS offers a far cheaper alternative to weapons such as the Tomahawk cruise missile, which can cost around $2.5 million.
Lessons from the Ukraine war
Much of what the world is seeing today was first demonstrated during the Russia–Ukraine war.
Since 2022, Russian forces have used Iranian-designed Shahed drones extensively to strike Ukrainian infrastructure and cities.
Ukrainian officials say the country has developed some of the most advanced practical methods for countering Shahed drones due to years of repeated attacks.
Military strategists increasingly believe that cheap autonomous drones could become as transformative as precision missiles once were.
Instead of relying only on expensive high-tech weapons, modern warfare may increasingly involve large numbers of low-cost systems designed to overwhelm defences.
For countries investing billions of dollars in missile shields, the rise of drones costing a few tens of thousands of dollars presents a difficult question: how to defend against weapons that are cheap enough to launch in massive numbers.