Despite years of escalating U.S. sanctions, a steady flow of critical components continues to reach drone factories in Iran and Russia. At the center of this supply chain is China, where small and often obscure companies are openly exporting dual-use goods that can be used in both civilian and military systems. The result is a resilient network that is helping sustain modern drone warfare.

Chinese exporters are shipping a wide range of components essential to drone production. These include engines, microchips, fiber-optic cables, gyroscopes, lithium-ion batteries, and navigation systems. Many of these items are considered dual-use, meaning they have legitimate civilian applications but can also be integrated into military systems.

Chinese customs data shows that hundreds of containers filled with such goods have been sent to Iran and Russia. In earlier stages, exporters often mislabeled shipments to evade detection. However, officials and analysts now say that in many cases, companies are no longer even attempting to hide the nature of their exports.

One of the clearest examples is the Chinese firm Xiamen Victory Technology. The company marketed engines suitable for drones and even displayed imagery of a Shahed-style drone on its website. A promotional email from the company stated, “We are deeply shocked and outraged by the aggression against Iran, and our hearts are with you,” while offering to sell drone engines.

A key component in this supply chain is the Limbach L550 engine. Originally a German-designed aero-piston engine, it has become widely associated with Iran’s Shahed-136 drone, a one-way attack drone used extensively in Ukraine.

The L550 is a compact internal combustion engine designed for light aircraft and drones. In civilian contexts, it can power small aviation platforms. In military use, however, it provides propulsion for long-range attack drones capable of carrying explosive payloads over distances of up to 1,000 miles.

Because of its reliability and relatively low cost, the L550 has become a cornerstone of Iran’s drone program. U.S. regulations prohibit its sale to Iran and Russia, yet Chinese companies have continued to market and supply it.

How the Supply Chains Work

The movement of these components relies on complex routing and financial systems designed to evade sanctions. Historically, U.S. and European-made parts were shipped to authorized distributors, then routed to retailers in mainland China or Hong Kong. From there, they were exported to Iran and Russia.

Payments are often handled through shell companies, particularly in Hong Kong, which obscure the final destination of the goods. Even when networks are exposed and sanctioned, new front companies quickly emerge to replace them.

According to former U.S. Treasury official Miad Maleki, “They either don’t care or have chosen not to interfere,” referring to China’s role in allowing these flows to continue.

More recently, the system has evolved. Increasingly, the components are no longer Western-made but produced directly within China. This shift reduces reliance on foreign supply chains and makes enforcement even more difficult.

The logistics behind these shipments are equally important. Goods often pass through multiple jurisdictions before reaching their final destination. China and Hong Kong serve as major hubs, but additional transshipment points are used to further obscure the supply chain.

These routes are part of a broader system involving distributors, logistics firms, and intermediary countries. The use of third-party hubs allows exporters to bypass direct restrictions and complicates efforts to track and intercept shipments.

Investigations have shown that even when one network is sanctioned, another quickly takes its place, maintaining continuity in supply.

The “Axis of Evasion” Explained

Analysts at the Atlantic Council have described this system as part of an “Axis of Evasion.” This term refers to the coordinated economic and technological relationships between China, Russia, and Iran that allow them to bypass Western sanctions.

This axis operates through integrated supply chains that exist largely outside the Western financial system. By trading in alternative currencies, using barter arrangements, and relying on decentralized networks, these countries reduce their exposure to U.S. enforcement mechanisms.

The system is not limited to drones. It also includes oil trade, alternative payment systems, and the transfer of technologies such as navigation equipment and chemical precursors for missile production. Together, these elements form a self-reinforcing network that strengthens each participant.

The implications of this supply chain are significant. Drones like the Shahed-136 are relatively inexpensive, costing between $20,000 and $50,000 to produce, yet they can overwhelm air defenses and strike critical infrastructure.

The availability of Chinese components has allowed Iran and Russia to scale production rapidly. In some cases, exports of key materials have surged in direct response to battlefield developments. For example, shipments of fiber-optic cables increased after Russia began using cable-controlled drones to evade electronic jamming.

Joseph Webster, a senior fellow tracking the data, said, “There’s really no explanation that’s plausible other than this is being used for the military. It’s extremely blatant.”

At the same time, reliance on lower-quality components may introduce trade-offs. Some analysts note that drones built with cheaper parts have experienced failures, suggesting that sanctions are having a partial effect by degrading performance rather than stopping production entirely.

The continued flow of Chinese-made components into Iranian and Russian drone programs underscores a fundamental shift in modern conflict. Warfare is no longer dependent on rare, highly controlled technologies. Instead, it is powered by globalized supply chains that are difficult to monitor and even harder to stop.