Following Russia’s invasion of Ukraine in February 2022, Western governments expelled numerous Russian intelligence operatives and imposed sanctions on companies linked to the Kremlin, intending to disrupt Russia's access to military technology. Despite these measures, intelligence officials report that many barred agents have relocated to Japan, exploiting the country’s comparatively lax espionage laws and robust technology sector to acquire components critical to Russia’s military efforts.

Japan has become an unintended hub for Russian military intelligence, particularly the activities of a clandestine unit known as the 20th Directorate. This unit, linked to Russia’s military intelligence agency, the G.R.U., focuses on procuring and smuggling battlefield technology into Russia. Officers often operate under diplomatic or commercial cover, including postings within Russia’s state airline Aeroflot, whose Tokyo office is located just minutes from the headquarters of Japan’s National Police Agency. Maksim Vladimirovich Filchenkov, a veteran G.R.U. officer, has been identified by intelligence sources as leading the Directorate’s operations in Tokyo since February 2024.

The reliance on Japanese technology is notable because Japan produces high-tech components found in up to 90 percent of Russian missiles and drones, according to Ukrainian government estimates. Investigations into Russian weapons that have struck Ukrainian targets have uncovered Japanese-made parts, including circuit boards and semiconductors, despite international export bans designed to prevent such transfers. While Japanese firms like Nippon Electric Corporation, Panasonic, and Toshiba have denied direct involvement, stating products identified in conflict zones were outdated or re-exported through third countries, Ukrainian officials have repeatedly submitted diplomatic notes to Tokyo warning of the illicit use of Japanese technology in Russian weaponry.

Japanese authorities acknowledge the espionage threat and have begun efforts to strengthen intelligence capabilities and tighten export controls. Parliamentarians and officials have expressed concern about the country’s historically weak intelligence framework, which stems from post-World War II restrictions that left Japan without a formal foreign intelligence agency. Prime Minister Sanae Takaichi has prioritized bolstering Japan’s ability to counter intelligence threats and prevent sanction evasion. Tokyo has also joined Western partners in sanctioning Russia and has provided non-lethal military aid to Ukraine.

Despite these steps, critics argue that Japan’s response has been slow and insufficient. Western intelligence services have warned Tokyo about networks facilitating the shipment of sensitive equipment to Russia, including shipping firms like Proco Air. This company rents cargo space on flights connecting Japan to Russia via third countries and, while denying any illegal activity, has business ties to entities and individuals sanctioned in other countries. Japanese law enforcement has limited means to prosecute espionage or sanction evasion due to a lack of specific legislation.

In January 2025, police uncovered a Russian intelligence officer posing as a Ukrainian who attempted to steal industrial trade secrets, highlighting ongoing espionage concerns. Nonetheless, some experts believe tighter legal frameworks and increased international cooperation are necessary for Japan to more effectively thwart Russian intelligence operations and prevent technology transfers that sustain Russia’s war effort in Ukraine.