to comment on this scenario, it would be world war III (the nuclear addition).... koreans, japanese, and chinese are all asians... different ethnicities, but the same race.... brothers may fight and may not talk to each other for years, but when someone messes with one of them, it's like messing with all of them....
You legit have no CLUE about Asia, do you?
Japanese and Korean people hate each other more than they hate anyone else in the world....except that Japanese and Chinese people might hate each other just as much. Vietnam and Cambodia are brutal, sworn enemies. Cambodia and Thailand don't feel much better about each other. Taiwan would be jumping up and down in excitement if someone ever took it to China. Burma hates Bangladesh passionately. East Timor hates Indonesia. Multiple minority ethnic groups in Vietnam and Laos jumped onto the American bandwagon during the Vietnam War because they hated the majority ethnic groups in their country so much. And Philippines has had beef with all sorts of other countries at one time or another.
The idea that these countries would side with other Asians just because they Asian is pure .
Do you not know anything about what went down during World War II, the Vietnam War, and the Cold War?