If they chicoms think they will intervene over Taiwan they will nuke Japan at some point. The IJN can do a lot of damage to the chicom fleet. If it does come to war with China I hope the Kido Butai can run wild for more than six months.
If nukes get involved at all, that’s game over. We’d hit back, then they’d knock out the to 40 or so US cities and China’s nukes are relatively high yield. End of the world for China and USA for sure.