Rare earths are used across a wide swath of products, including smartphones, automobiles and medical equipment, and powerful magnets made with rare earth elements are central to electric motors and other industrial applications. While China has argued that non-military export applications should be approved, industry participants said procedures have become heavier and approvals slower, creating what amounts to an export stoppage in practice. Japan’s ability to endure a prolonged cut-off remains the key question, because stockpiles are finite and costly. Experts on the program argued the government may need to expand subsidies and support for stockpiling and alternative procurement. For Japan’s manufacturers, the immediate challenge is replacing supplies that have been dominated by China for decades.