The two countries are concerned that Chinese, Russian, or North Korean hypersonic weapons— could overcome existing missile defence systems.


This article by Kyle Mizokami, writing for Popular Mechanics, makes the following points:
  • Japan and the US both need defences that can counter Mach 5+ missiles.
  • Existing air-defence systems cannot take down fast-moving targets in the atmosphere.
  • Chinese hypersonic missile could reach Japan’s capital, Tokyo, in just over 12 minutes.


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