China has managed to hit the U.S. where it hurts the most in response to the Trump administration’s tariffs, with restrictions on global exports of certain rare-earth elements that the U.S. has little ability to produce or refine.

China's latest export restrictions on Scandium and Dysprosium threaten to disrupt global supply chains for major tech players, but also emphasize potential weaknesses of its anti-sanctions approach.

China has stopped exporting rare earth minerals and magnets after U.S. President Donald Trump raised tariffs on Chinese goods to 145%, according to The New York Times. Shipments have been halted at all Chinese ports while Beijing works on new rules that could block sales to certain companies — including American defense contractors.