I'll try to fill in as best I can then.
The nationalists would have crushed Mao and we would have an anti communist authoritarian government in China. It will be interesting to see the cold war dynamics between the US, China, Japan, and the USSR. I think we could possibly see a Soviet-Japanese alliance of sorts since the US and Japan would still be rival powers in the Pacific. And you thought anti-Japanese sentiment in the 80's were bad.
I just don't see any reason for Japan to align with the Soviets against the US. All of their trade is with non-soviet nations, including the US. The US will be able to protect this trade, and to offer them trade into the US market like they did historically. Against this, the Soviets can offer... nothing, really. Japan-US animosity was over things like trade in China, which will probably be a dead letter anyway. I think the wave of decolonization will mean that the Phillipines goes independent, the concessions in China disappear... and with them, the reasons for US-Japanese conflict disappear too.
Not to mention that in the 1930s, it was possible for Japan to build up enough of an navy (at huge expense) to have a viable force against the US. The war will mean that the US will build up a navy to suit their huge industrial potential, a bigger navy than the UK. After that, I think it will be completely clear even to those that want to keep a fully independent foreign policy that it just isn't possible anymore to really counter the USN.
What would happen to Korea?
Will they remain part of Japan or they will be Independent at some point?
If they will be independent, who will be in charge? Communists or some others?
As I said above, I think decolonization is inevitable. Japan might well try to hold on to Korea and Taiwan longer than some of the European empires try to hold on to their colonies, but in the end, Korean independence is a foregone conclusion. They will never be satisfied with anything less, and Japanese people ultimately won't want to pay the price in blood and infamy to hold on. It's entirely possible that Japan fights a war against Korean independence fighters on the grounds of "anti-communism", though, which could be quite bloody.
It's possible Taiwan would eventually be incorporated as regular prefectures of Japan, but it's also possible that it simply becomes independent. I could see it going either way. Much depends on Japanese policy--whether they are willing to give full civil rights to Taiwanese in order to keep them satisfied, or whether they try to push back. It's possible that the Japanese give devolution and rights to the Taiwanese and see them as "the good colonials", in contrast to the "violent" Koreans. It's also possible that they see the unrest in Korea and fear it, and so crack down in Taiwan as well... hard to say, I think.