BLUF

This signals China's intent to challenge Japan's defence posture, reinforce claims in the East China Sea, and test regional response readiness.

Summary

  1. Yonaguni’s location vital for surveillance evasion.
  2. Taiwan’s and Japan’s navies may face increased challenges.
  3. China's hydrological surveys may support Chinese submarines’ missions.
  4. Cooperation between Taiwan and Japan essential.

References