That is because Ukraine has nationalists, but no more Nazis than Russia or, for that matter, the US - so they do not worry about your imaginary friends because they are yours.
People in Ukraine fought the real Nazis in WW II. Putin is currently acting like a Nazi (e.g. 15 years of prison for anyone complaining).
I think you have a serious problem with terms and definitions that you'd better discuss with a dictionary.
The main reason for this war is Crimea. Putin needs a port that the RF can use all through the year and he has decided that it is even better to have the base in Sebastopol and steal from Ukraine Mariupol and anything in between the two.
The main reason for Russia's invasion of Ukraine is the genocide of the Russian-speaking population in Donbas. The issue with Crimea was closed in 2014, it’s just that Ukraine has difficulties with the stages of accepting the inevitable, it is stuck at the stage of denial.
Sure Wagner is an illegal group and Santa Claus is meeting Superman today for tea. Wagner is fighting in the front, receiving money and weaponry from the RF government and I do not see anyone taking to justice the wagnerites - in fact the RF has supplied convicts as soldiers (cannon fodder).
I cannot separate Wagner from Wagner and Wagner from Putin because they are one and the same, just cut the official bullshit seriously, you will be left will zero credibility if you have any left.
26000 have completed they contract and retired as fertiliser for the Ukrainian soil, dying as stupidly as all the rest of the young RF citizens sacrificed for nothing. From your point of view, I am sure that you consider the "experiment" very successful.
Meanwhile, the deep strikes RF people keep smoking in the wrong places deep in the occupied territories and in the RF.
All the Wagnerites who died during the liberation of Bakhmut are buried in Russia. For example, there is a Wagner cemetery in the city of Goryachiy Klyuch in the Krasnodar Territory and in the city of Berezovsk in the Sverdlovsk Region. Tens of thousands of soldiers of the Armed Forces of Ukraine are fertilizing the Ukrainian land, whose bodies no one was even going to take out of Bakhmut, and there was no physical possibility.