Ukrainian President Volodymyr Zelenskyy accused China on Tuesday of being indirectly involved in Russia’s drone production efforts. He claimed that Chinese citizens were working at a drone factory in Russia and suggested that Moscow might have stolen drone technology from China, although he implied Beijing may not have been aware of it.

This is the latest in a series of accusations from Kyiv, which also included Zelenskyy’s previous comments about China supplying Russia with weapons and gunpowder. These remarks marked the first time Zelenskyy openly accused Beijing of directly aiding Moscow’s military efforts, although China has firmly denied these claims.

In response, Ukraine’s Foreign Ministry summoned Chinese Ambassador Ma Shengkun to express serious concerns about China’s involvement in the war. Zelenskyy appeared to soften his tone, stating that Russia might have secretly obtained drone technology from Chinese nationals working in Russia without Beijing’s official approval.

Zelenskyy’s comments come at a delicate time for Ukraine, with ongoing diplomatic efforts led by the U.S. to end the war. Earlier this month, Zelenskyy accused Russia of recruiting Chinese nationals to join its forces, adding that Beijing was likely aware of the recruitment, though it hasn’t been confirmed if they were receiving instructions from Chinese officials.

Despite these tensions, China has reiterated its support for peace efforts and cautioned against irresponsible remarks regarding the involvement of Chinese nationals in the conflict. Zelenskyy stated that Ukrainian officials have been directed to communicate their findings directly with the Chinese government through official channels, as they continue to investigate the extent of China’s possible role in Russia’s military operations.