- STM32 chips continue to appear in Russian drones despite sanctions
- Chinese supply chains help civilian components reach military applications
- Commercial networks make it increasingly difficult to track dual-use technologies around the world
A Swiss-designed microcontroller continues to surface in weapons Russia launches against Ukraine.
Ukrainian military intelligence recovered an STM32 chip made by STMicroelectronics from a Geran-4 drone shot down in May 2026.
That month, the Ukrainian database had recorded STMicroelectronics’ parts from recovered drones, missiles and war systems 270 times – a figure that is more than twice the number of chips from any other European manufacturer in the same database.
How a European chip reaches Chinese drone makers
STMicroelectronics names Avnet, a Phoenix-based distributor, as a key partner for its STM32 microcontroller line.
Avnet’s Hong Kong subsidiary has sold increasing volumes of these chips to Shenzhen Hobbywing Technology, a Chinese manufacturer of drone propulsion systems.
Hobbywing’s purchases from this subsidiary increased from approximately $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, maker of the T-Motor brand.
Sanrui revealed that it purchased more than $7 million worth of controllers from Hobbywing in the first half of 2025 alone.
Sanrui’s subsidiary, Jiangxi Xintuo, was later blacklisted by Washington for exporting drone technology for the Russian military.
Trade records show that Xintuo shipped T-Motor products to at least six Russian buyers who were then subject to sanctions.
Samuel Bendett, a researcher specializing in Russian military technology, said Beijing plays a major role in helping Moscow evade sanctions.
“There’s no simple way to stop this,” he said, describing how dual-use components move through civilian trade networks.
Analysts note that once a chip enters China’s manufacturing line, it becomes much more difficult to trace its exact origin.
Legal experts call this process a substantial transformation, since components are integrated into new products before reaching their destination.
Records reviewed do not confirm that a single recovered chip followed this specific documented route.
Sanctions have done little to slow the flow
Western governments have imposed export restrictions against Xintuo and Sanrui, but both companies appear to have adapted quickly.
Sanrui’s recent statements have identified new trading partners and are now exporting through what it calls Eastern European networks.
A sanctioned Xintuo-linked website continued to sell T-Motor products worldwide, and as of this month still accepts major credit cards.
These companies’ supply chains appear deeply entrenched, and a single ban could slow them down but not stop them completely.
“The goal is not just to build Chinese drones… It’s about ensuring scale and strengthening a system that can absorb real-world battlefield feedback,” said Lilly Lee, a researcher at Taiwan’s DSET think tank who studies China’s drone industry.
She argued that a massive civilian drone industry, inherently dual-use, proves more difficult to dismantle through sanctions or war.
This dynamic reveals why cutting off a single supply route rarely prevents chips from reaching battlefields.
Even robust civilian trade between China and Russia can support military applications without any explicit government cooperation.
Via Kharon
