I hope they shoot the cr*p out of each other.
I hope it goes on for years, though it certainly will not.
In fact these two have fought something like 9 or 10 wars with each other —ancient rivals.
We have a popcorn emergency on our hands.
The island crises with PI or VN are interesting, but the one that would almost certainly involved the USN directly would be the Senkaku Islands, claimed by China, Japan and Taiwan.
China could not take and also hold one of all Senkaku Island(s) without also holding one or all of the Japanese Yaeyama Islands, which are uncontested, closer to Taiwan and have 7 good airfields.