So apparently China is considering a territorial claim over Okinawa.
https://www.theguardian.com/world/2013/may/15/china-okinawa-dispute-japan-ryukyu
https://www.dw.com/en/japan-angered-by-chinas-claim-to-all-of-okinawa/a-16803117
https://www.theguardian.com/world/2013/may/15/china-okinawa-dispute-japan-ryukyu
https://www.dw.com/en/japan-angered-by-chinas-claim-to-all-of-okinawa/a-16803117