China has announced a ban on exports to the United States of gallium, germanium and other key high-tech materials with potential military applications.

Over the past several months, China has started tightening control over its supply of rare materials. It started limiting the export of antimony — a mineral used for chipmaking

Beijing tightened controls on the export of key raw materials to the U.S. and cautioned Chinese companies against buying American chips.

The United States on Monday issued new restrictions on the export of some semiconductor chips and equipment to China, citing national security. The measures are "designed to further impair" China's capability to produce advanced semiconductors "that can be used in the next generation of advanced weapon systems and in artificial intelligence (AI) and advanced computing,

Beijing said it would restrict exports to the United States of some key components in making semiconductors. The development comes after Washington announced curbs targeting China's ability to make advanced chips.