North Korean workers have been linked to two companies that support Russia’s military-industrial complex, according to a new investigation, documenting a network of Russian firms and individuals that disguise employment as education to circumvent sanctions.

In a report released Thursday, The Hague-based Global Rights Compliance (GRC) states that North Koreans have been found to work at a Russian factory producing military rations, and that DPRK officials inspected a defense supplier seeking to employ North Korean laborers.

The findings point to a system that could serve the interests of both Moscow and Pyongyang: supplying labor to Russian businesses while generating revenue