Western officials believe they have evidence that Chinese companies have secretly supplied weapons to Russia in what could amount to a significant escalation of Beijing’s involvement in the Ukraine war.

A new report obtained by allies points to a Chinese company sending a range of purpose-built military drones to Russia for testing, with the ultimate destination being Ukraine, The Times understands.

The deal occurred last year, according to a western official, who was unable to disclose the name of the company. However, they said there was “clear evidence now that Chinese companies are supplying Russia with deadly weapons for use in Ukraine”.

“While the Chinese government might not admit it, they are going to struggle to keep their increasing support under wraps,” added the official, appearing to accuse Beijing of being involved or aware of the delivery.

They also confirmed a Reuters report from earlier in the week that Russia is believed to have established a weapons programme in China to develop and produce long-range attack drones for use in the war against Ukraine.