This paper offers a comprehensive analysis of the manufacturing process of Russian air defence systems, demonstrating significant vulnerabilities in their production that could be exploited to disrupt their modernisation and output.

As mentioned by @michaeldweiss on X:

Critical new report on the vulnerabilities of the Russian S-400. The platform’s electronics are heavily reliant on Rogers, a company in the U.S., with loose export controls and a Chinese subsidiary; and on one in Kazakhstan, which has not been sanctioned. Also, the S-400’s guidance and control systems are made at two facilities in Russia – both within striking distance of Ukraine’s Flamingo cruise missile