Will Ukraine’s War Effort Be Threatened by Kamikaze Drone Engine Shortage?
A quiet industrial risk is emerging behind the rapid global adoption of cheap long-range attack drones. The risk is not airframes, guidance kits, or even warheads. It is the humble small piston engine—often air-cooled and derived from legacy light aviation or industrial designs—that makes Shahed-class systems economically viable.
One of the most effective tactics in Ukraine’s asymmetric warfare against the Russian juggernaut has been their deep drone strikes against Russian infrastructure. Crippling or destroying oil and gas production, storage, and transshipment facilities has raised the cost of Putin’s war considerably, and continues to drain funding for the Russian war machine.
However, if NATO Europe starts mass-producing long-range kamikaze drones without increasing the supply of cheap engines, the global supply of these engines could tighten sharply. That would complicate Western procurement plans and erode one of Ukraine’s most effective tools.
The warning signs are already visible.
The war in Ukraine has industrialized cheap one-way attack drones. They now are routine instruments of strategic pressure. Both Russia and Ukraine rely on long-range drones to reach energy facilities, logistics hubs, and military infrastructure.
This shift has exposed a structural truth: the hardest component to scale cheaply is not the airframe. It is the propulsion system that delivers sufficient range at acceptable cost and reliability.
Two-stroke, air-cooled piston engines—and closely related small aviation engines—occupy a narrow but critical performance niche. They offer favorable power-to-weight ratios, mechanical simplicity, and relatively low unit cost. That combination makes them well suited for expendable long-range drones where “good enough” reliability beats aerospace perfection.
But the supply ecosystem for these engines is thinner than it appears.
Open reporting has already linked Russian long-range drone production to a limited set of suppliers, including engines derived from the Limbach L-550E family produced by Xiamen Limbach in China. At least one such firm has been designated under EU sanctions, while U.S. authorities have moved to disrupt networks supporting Russia’s drone production base. China is also supplying Ukraine, through various schemes involving reexports from Turkey and other “neutral” countries. Often parts are purchased in China with minimal assembly in European countries. These tactics of mislabeling and sanctions-evasion are a sign of constricted supply.
Another factor that limits supply, according to Ukrainian sources, is that Russian- and Chinese-produced Shahed-type engines have shorter service life than Iranian originals. In other words, the market can tighten even if nominal production numbers appear stable.
Ukraine itself has tried to produce its own two-stroke engines. However, quality control culture in Ukraine is notoriously lacking, and Ukraine-produced engines also suffer as a result.
The United States and NATO allies are expanding rapidly into the cheap loitering munitions that use cheap two-stroke engines. These are more consistent and better funded buyers than Ukraine, and they crowd out Ukrainian orders as the United States is expanding the LUCAS program (Low-Cost Uncrewed Combat Attack System) and allies are following suit.
The February 2026 letter of intent under the European Long-range Strike Approach (ELSA), signed by six European nations, is the clearest institutional signal yet that Western militaries are internalizing the Shahed lesson: mass and affordability matter.
The danger is not simply higher demand. It is convergent demand.
With multiple NATO programs all requiring 300 mile-plus one-way drones using low-cost piston propulsion, the supplier base will be unable to provide th engines. Unlike composite airframes, which can be distributed across many manufacturers, small aviation engines require precision machining, high-quality bearings and seals, ignition electronics, and endurance testing infrastructure. These are slower to expand and harder to improvise under surge conditions.
With 10 to 14 NATO members procuring cheap deep strike drones, the demand in the coming year is likely to be about 30,000 per member. That brings the total number to about 420,000 units, but there is no concomitant increase in engine production. Where are all those engines going to come from?
Kyiv does not need to “run out” of engines to feel the impact. A tightening global market will raise prices, lengthen delivery schedules, and force increased reliance on lousy Chinese-produced engines. High quality engines and parts will be sold to NATO members, rather than Ukraine, because producers don’t want to deal with Ukraine’s notoriously difficult procurement system.
Because Ukraine’s deep-strike strategy relies on sustained pressure against Russian energy and logistics nodes, even modest reductions in reliable long-range drone output could blunt strategic effects.
The lesson from the past two years is clear.
In the era of mass expendable air warfare, industrial depth, not technological elegance, determines staying power. Europe’s embrace of low-cost long-range drones may be strategically sound, but unless the engine-production base scales up with it, the next bottleneck in this war will not be guidance chips or composite wings.
It will be the small engines that keep them flying.
Bart Marcois is the former Principal Deputy Assistant Secretary of Energy and a former career foreign service officer. He produces daily news analysis shorts on YouTube at “A Minute With Bart.”
And for our recent publications on the global war in Ukraine, see the following: