The US has placed Chinese groups accused of building supercomputers to help the Chinese military on an export blacklist, the first such move by the Biden administration to make it harder for China to obtain US technology.

Three companies and four branches of China’s National Supercomputing Center were added to the US government “entity list,” which bars American companies from exporting technology to the groups without a license.

The US commerce department said the groups were involved in building supercomputers used by Chinese “military actors” and facilitating programs to develop weapons of mass destruction.