- STM32 chips continue to appear inside Russian drones despite sanctions
- Chinese supply chains help civilian components reach military applications
- Trade networks make tracking dual-use technology increasingly difficult worldwide
A Swiss-designed microcontroller keeps showing up inside weapons Russia is firing at Ukraine.
Ukrainian military intelligence recovered an STM32 chip made by STMicroelectronics from a downed Geran-4 drone in May 2026.
As of that month, Ukraine’s database had logged STMicroelectronics parts 270 times across recovered drones, missiles and warfare systems — a number that is more than twice as high as any other European manufacturer’s chip count in the same database.
How a European chip reaches Chinese drone manufacturers
STMicroelectronics names Avnet, a Phoenix-based distributor, as a key partner for its STM32 microcontroller line.
Avnet’s subsidiary in Hong Kong sold increasing quantities of these chips to Shenzhen Hobbywing Technology, a Chinese drone propulsion manufacturer.
Hobbywing’s purchases from this subsidiary grew from about $400,000 in 2024 to $1.95 million in 2025.
Hobbywing then sells electronic speed controllers built with these chips to Nanchang Sanrui Intelligence Technology, manufacturer of the T-Motor brand.
Sanrui revealed that he bought more than $7 million worth of controllers from Hobbywing during the first half of 2025 alone.
Sanrui’s subsidiary, Jiangxi Xintuo, was later blacklisted by Washington for exporting drone technology that supports Russia’s military.
Trade records show that Xintuo shipped T-Motor products to at least six Russian buyers who were later placed under sanctions.
Samuel Bendett, a researcher focusing on Russian military technology, said Beijing is playing a major role in helping Moscow avoid sanctions restrictions.
“There is no straightforward way to stop it,” he said, describing how dual-use components move through civilian trade networks.
Analysts note that once a chip enters China’s production chain, it becomes far more difficult to trace its exact origins.
Legal experts call this process substantial transformation, as components are incorporated into new products before they reach their destination.
The records reviewed do not confirm that any single recovered chip followed this precise documented route.
Sanctions have done little to slow the flow
Western governments have imposed export restrictions on Xintuo and Sanrui, but both companies appear to have adapted quickly.
Sanrui’s latest filings identified new trading partners and now exports through what it called the Eastern European Networks.
A website linked to sanctioned Xintuo continued to sell T-Motor products globally and, as of this month, accepted increasingly major credit cards.
The supply chain of these companies appears to be deeply entrenched and a single ban could slow them down but not stop them completely.
“The goal is not simply to build Chinese drones… It is to ensure scale and to strengthen a system that can absorb real-world feedback on the battlefield,” said Lilly Lee, a researcher at Taiwan’s DSET think tank, which studies China’s drone industry.
She argued that a massive civilian drone industry, inherently dual-use, would prove more difficult to dismantle through sanctions or war.
This dynamic reveals why disruption of a single supply route rarely prevents chips from reaching the battlefields.
Even robust civilian trade between China and Russia can sustain military applications without any explicit government cooperation.
Via Kharon
