Okinawa is the KEYSTONE of the Pacific >https://www.kadena.af.mil/About-Us/Fact-Sheets/Display/Article/416975/okinawa-information/
"Okinawa, the principal island of Okinawa Prefecture's 160 or so islands, is often referred to as the "Keystone of the Pacific" because of its strategic location relative to major Far East cities."
Watch the water >How China fits in.
https://www.nationalreview.com/2018/12/china-sea-power-challenges-international-order/