Russia is selling military equipment and technology to China that could help Beijing prepare an airborne invasion of Taiwan, according to an analysis of leaked Russian documents by a UK-based defense and security forum.

The Royal United Services Institute’s (RUSI) analysis is based on about 800 pages of documents, including contracts and lists of equipment to be supplied by Moscow to Beijing, from the Black Moon hacktivist group, which previously published some of the documents online. It does not identify its members, but describes itself in a manifesto as opposed to governments that carry out aggressive foreign policy.

The authors of the RUSI report shared some of the documents with The Associated Press and say they appear to be genuine, although parts of the documents might have been omitted or altered. AP is unable to independently verify their authenticity.