I admit I have always assumed the JSDF would end up fighting the PLAN if the latter tried to invade or blockade Taiwan.
As I'm sure you are well aware Yonaguni Island is just over 100km as the seabird flies from the nearest bit of Taiwan so there's almost no way that they can not infringe on Japanese waters/air space between Taiwan and Yonaguni if they want to blockade Taiwan successfully.
If they don't blockade the ~150km ocean distance from Keelung to Yonaguni then they can't effectively blockade Taiwan. If they do blockade it and in the process some assets get their location wrong (which is a few seconds of inattention in an aircraft) they violate Japanese territory. My feeling is that there's a faction within the SDF (if not the government) that would react to such incursions by trying to shoot down the aircraft involved (or sink the ships...). That would automatically cause the PLAN/PLAAF to attack whatever SDF asset was involved in retaliation and then we're off to the races. A war with the PRC that was perceived to be caused by the PRC attacking Japan would be pretty popular IMO (and I live in Japan) because there's a lot of latent hostility to the PRC, particularly thanks to COVID
I admit I have always assumed the JSDF would end up fighting the PLAN if the latter tried to invade or blockade Taiwan.
As I'm sure you are well aware Yonaguni Island is just over 100km as the seabird flies from the nearest bit of Taiwan so there's almost no way that they can not infringe on Japanese waters/air space between Taiwan and Yonaguni if they want to blockade Taiwan successfully.
If they don't blockade the ~150km ocean distance from Keelung to Yonaguni then they can't effectively blockade Taiwan. If they do blockade it and in the process some assets get their location wrong (which is a few seconds of inattention in an aircraft) they violate Japanese territory. My feeling is that there's a faction within the SDF (if not the government) that would react to such incursions by trying to shoot down the aircraft involved (or sink the ships...). That would automatically cause the PLAN/PLAAF to attack whatever SDF asset was involved in retaliation and then we're off to the races. A war with the PRC that was perceived to be caused by the PRC attacking Japan would be pretty popular IMO (and I live in Japan) because there's a lot of latent hostility to the PRC, particularly thanks to COVID
PS regarding any invasion I wrote this just over a year ago - https://freethepeople.org/taiwan-the-map-is-not-the-territory/