Having a bunch of Nazis in your army, having a bunch of Nazis in your political body, sending children into Nazi radicalization summer schools, having an infinite source of photos of thugs with swastika tattoos and schoolchildren throwing Sieg Heil, international fascists all excited to go to kill Russians in Ukraine alongside their ideological brethren, (as letranger's comment above reminds us) streets and holidays and events being named after brutal Nazis who slaughtered thousands of civilians, constant rhetoric since 2014 about how all Russians are "orcs" followed by routine violence against ethnic Russians, Jews, brown people, black people, and gay people in Ukraine that killed thousands before Russia did a single thing in this conflict, yeah this doesn't mean it's a Nazi regime though. Don't you think if it was, Zelensky would have gone on TV to say, "Hey guys, we're a Nazi regime!" ??? I mean prior to this war all the center-left mainstream Western news outlets were talking about how much corruption and how many Nazis were in Ukraine but really, that's just insane Russian conspiracy. Stupid Russians don't know a thing about what constitutes a Nazi, amiright? Oh wait, every country outside the West is either neutral or supports Russia? Sounds like there are 6.5 billion Russian bots on this planet...