You are ignoring that groups like Azov, which are explicitly neonazi, are part of Ukraine's military in an official capacity. Russia hires Nazi mercenaries, but it does not have Nazi divisions within its own government (though there are cliques that are personally/conspiratorially fascist). There is also the issue of Stepen Bandera being the national hero and defended in all sorts of ways (including Holocaust denial) by the Ukrainian government. Putin and friends are cynical mafiosos, but they aren't out there denying that the Tsar did pogroms.

I have no idea what you are talking about with China unless you are just upset at some Chinese media talking about the Nazi problem in Ukraine.

Also, as others said, let the people of Donbas and Crimea decide. Oh wait, they kind of did, and it turned out that they didn't like the government that was ethnically discriminating against them.