Ukrainian Nazis, while still ultra-right-wing and probably not nice people, trace their ideological lineage to WW2 Nazis not by believing in Hitler's vision (which would be dumb, Slavs were supposed to be genocided to make living space for more Germans) but because the Nazis treated (some of) Ukrainians better than the Soviets (some of the time). So they wear Nazi symbols but don't necessarily subscribe to clean race and taking over the world "for us better people" and genociding everyone else. Even the craziest Ukrainian Nazi is probably not looking to invade Poland and replace Poles with "superior Ukrainians".
Meanwhile the Russian Z's are running aggressive war, consider themselves superior culture and want to take over most of Europe. They are doing war crimes left and right and their stated goal is a genocide of Ukraine (see "Ukraine is not a country, Ukrainians aren't people" statements from Putin) and rule of Europe.
Genocide is of something Russians are fond of doing pretty often, see Holodomor and mass deportations and Russification for "more hard" and "softer" approaches. Oh and they're doing those things again right this moment - kidnapping people to Russia and attacking Ukrainian food stores and targeting fucking maternity wards of hospitals.
So you could argue that despite swastikas on clothes, the Russians are "the true Nazis" here. What makes a Nazi, symbols or genocidal aggressive war backed by ideology of racial superiority?
Normally, I'd say fuck all Nazis, but I can give a lot of leeway to people fighting to protect their homeland from genocidal murderous raping horde. Especially as repeating "but there are Ukrainian Nazis!" only helps Russia, and why the fuck would you want to help Russia?