This is just a strategic move to be ready if China escalates to Taiwan. 

If China does so, Japan is left with no other choice than to retaliate with US/NATO to stop Chinese aggression. So, the most affected part would be the adjacent to Taiwan. So, Japan is getting ready for my situation before a
any serious breakout. 

Still, I believe that China won't escalate as of now, 

Coinsreporter

Its these islands that they mention... What is the thing Xi had said... reunification by 2030 or something? Makes sense Japan would move now to protect its citizens.

conspiracy

Ukraine continues attacks on Russian infrastructure against American orders

GhostofTruth

https://asia.nikkei.com/Politics/Japan-plans-2-week-shelters-on-islands-near-Taiwan

Its these islands that they mention... What is the thing Xi had said... reunification by 2030 or something? Makes sense Japan would move now to protect its citizens. 