Even if we consider "Wagner" to be "neo-nazi" with no evidence what so ever, as you noticed yourself, it's a PMC, so it's not a part of the military. And the ultimatum confirms that (you cannot demand people who are part of the military to join the military). As for "Rusich" relation to "Wagner" there are just Western journalists claiming that. "Wagner" is not very secretive and Prigozhin is making more videos than some ecelebs yet he never mentioned that nor has shown any "Rusich" troops.

Was it all you had?