The U.S. has added dozens of companies to its export control, including more than 50 based in China that it says sought advanced knowhow in supercomputing, artificial intelligence and quantum technology for military purposes.

The additions included companies that are customers of Intel and Nvidia, and one firm that was the focus of a New York Times investigation last year.

The United States added six subsidiaries of Inspur Group, China's leading cloud computing and big data service provider, and dozens of other Chinese entities to its export restriction list on Tuesday.