It's time for allies to de-risk from the U.S.

William Matthews is a senior research fellow for China and the World at Chatham House.

For years, China-watchers have warned that relying on Chinese tech could give Beijing coercive leverage. But in March, it was not China, but the U.S. that made that risk real. Satellite company Maxar cut off Ukraine's access to imagery under a U.S. government program, following Washington's decision to halt intelligence-sharing with Kyiv.