China will not allow the export of rare earth materials for use by foreign militaries under restrictions announced last week.

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.

The last week could just be a preview to China weaponizing its entire supply chain, the investor told Fortune.

China will not allow the export of rare earth materials for use by foreign militaries under restrictions announced last week.

Automotive industry groups have sounded the alarm over China’s latest move to impose restrictions on the export of rare earths.

As the trade war continues to escalate, China has hit back at Trump by suspending exports of rare earth minerals.

Beijing last week announced sweeping controls on rare earths ahead of an expected meeting between President Donald Trump and President Xi Jinping.

China holds a near-monopoly in the processing of the elements crucial for making everything from smartphones to fighter jets.