"Fuel to a fire" would be an accurate description - Beijing is counting on de facto reunification wid TAIWAN formally taking place,+ desires to have strategic access to Same to + from the East China Sea + WESTPAC "protected" by the Japan-claimed Senkakus [China = Daoyu Islands]+ Japan-controlled/sovereign Okinawa Islands [former pro-China Ryukyu vassal kingdom],+ other in the East China Sea. One can make a very good similar argument that China desires ditto as per its claims of sovereignty to 90% of the regionally-disputed South China Sea region.
Wid 10,000 of 18,000 US Marines staying behind in Okinawa, in addition to other USDOD, South Korea desiring to develop its own Nuclear Weapons-Arsenal if North Korea does so,+ Japan's own SDF planning to increase both the size + capabilities of its garrison on Yonaguni, ANY POST-REUNIFICATION CPLA MILBASES ESTABLISHED ON TAIWAN WILL BE SEVERELY OBSTRUCTED IFF NOT IRRELEVANT. Russia doesn't want China or Japan, etc. presence in the Sea of Siberia/Kamchatka/Okhostsk, while the US per se is now trying itself up in the CHina-claimed South China Sea.
Besides the above, outside of Yonaguni + Okinawa Japan also has control of IWO JIMA, which is considered by myself + local Perts as geologically part of the Marianas chain OF Islands; + as of this AM JAPAN REPOR NOW DESIRES TO BASE SDF PERSONNEL ON A ROTATING BASIS ON TINIAN ISLAND, WHICH IS DE FACTO POLITICALLY + GEOLOGICALLY PART OF THE AFOREMENTIONED MARIANAS CHAIN.
"POST-US", WORLD #1 WANNABE RISING CHINA ISN'T GOING TO LIKE ANY OF THIS ONE BIT.