The Japanese government has issued a warning to Japanese companies interested in supporting Ukraine’s postwar reconstruction, cautioning them about the security risks associated with using 5G telecommunications infrastructure built on technology from Chinese tech giant Huawei. The warning reflects growing concern in Tokyo over the potential for technical and sensitive information leakage through Huawei-equipped networks.
The alert comes after a major Ukrainian mobile operator conducted 5G pilot tests with Huawei in several cities last year. The Ukrainian government subsequently allocated 5G frequency bands to that operator. Japan’s Rakuten Group had also applied to participate in Ukraine’s 5G market but was not selected as a candidate.
According to Japanese government documents obtained by Kyodo News, officials flagged serious concerns about the spread of Huawei 5G infrastructure in major cities including the capital Kyiv. The documents specifically warned that investment in critical infrastructure — including the energy sector — carried significant risks for Japan, the United States, and European nations. Officials also expressed concern that Chinese-made equipment could enter the Ukrainian market indirectly, through Turkish intermediary companies, even without direct involvement from Chinese firms.
Huawei has long been identified as a security vulnerability by U.S. authorities and remains subject to American sanctions. Japan’s decision to issue this kind of economic security warning to private firms is considered an unusual step, underscoring how seriously the government views the risk of Huawei technology proliferating in strategically important regions. The move signals that Tokyo is prepared to take a more active role in guiding Japanese corporate behavior abroad when national and allied security interests are at stake.
Source: Kyodo News, March 12, 2026
https://china.kyodonews.net/articles/-/7862