The World Responds: China’s Mach 10 YJ-21 Missile Looks Like a Threat

China’s military showed its vaunted YJ-21 Eagle Strike hypersonic anti-ship missile at an air show during the week of Nov. 7. This is the first known public display of the YJ-21, which is reputed to be a carrier killer. The missile can be deployed on Chinese cruisers and aircraft carriers, and its introductio...