Elon Musk said China wants assurances that the rare-earth magnets needed to build Optimus will not be used for "military purposes."

President Donald Trump’s punitive tariffs provoked Beijing into demonstrating one of its key points of leverage.

China's decision to halt the export of magnets containing heavy rare earth metals has impacted Elon Musk's business, reports "The New York Times." This particularly affects the work on the Optimus robot,