Stocks tied to rare earths jumped after Trump threatened countermeasures against China, noting the country was holding the world "captive" over the metals.

Beijing announced its first controls on the technology used to mine and process the minerals, citing the potential threat to national security.

China tightens export controls on rare earths and related technologies to safeguard national security, impacting global supply chains.

Move is a strategic one ahead of new round of tricky trade talks with the United States.

Stock markets dropped on Trump's bellicose Truth Social post that said China is "becoming very hostile" in seeking tough export controls on rare earths.

Stocks tied to rare earths jumped after Trump threatened countermeasures against China, noting the country was holding the world "captive" over the metals.

The Chinese Ministry of Commerce said the controls, issued Oct. 9, were part of Beijing's effort to "better safeguard world peace and regional stability."

President Donald Trump on Friday threatened China with a "massive" increase in tariffs in retaliation for Beijing imposing strict controls on rare earths.