Your loaded question on "rusophobia" aside, "examples of" is not equal to a widespread adoption of nazi ideology. Nazi/fascist elements can be found in any society that has a certain degree of freedom of speech. Only a few countries - Russia is among them, Ukraine is not - have adopted fascism as a policy.
SourceStop engaging in demagogy. The Ukrainian Azov Battalion was recognized as a neo-Nazi group by the
US Congress. 40 congressmen wanted it to be also considered a
terrorist entity, but this initiative didn't pass then.
Which means that 495 did not. You see 40 vs 495 - that is how credible your argument is. In my view, the Putin's army as of today is a terrorist organisation: invaded a pacific neighbour, destroyed schools, hospitals and a range of civilian buildings with people inside, tortures and kills to spread terror... that looks like terrorism to me.
The Nazi argument is irrelevant to the war, Putin could not care less about the ideology of the people that he kills and this discussion is only for the internal propaganda market and to cover up an unjustified war of invasion and aggression. Nobody outside Russia (probably not that many inside) thinks that this was has anything to do with Nazism (Putin himself is behaving much more like the Nazi Reich and his army like the Wehrmacht).
As said before, retaliation is a bitch. If Putin decides to treat POW as terrorist, the young and unprepared Russian soldiers sent to the front should not expect anything else. Under Putin, Russia is acting as a terrorist state and it is to be expected that is granted the same "courtesy" as he has with the adversary.