There is no united Russian military as such, You have the regular military or what is left of them (and even within that there are the obvious subsets or army, navy, airforce, paras), the Rosgvardia, the various PMCs like Wagner and the Kadyrovites, the separatist militias... and they all hate each other. Even the different PMCs hatte each other
And even within units there is infighting. There was a video released the other day of a Wagner officer lying shot and injured, three men run to his rescue (which is odd for Russians), pick him up and carry him behind a shed and then completely stove him in with what look like shovels. It just makes no sense whatsoever