It should be pointed out that whatever the actual number of dead, and the real numbers are secret, they include the cream of the RGF and Naval Infantry (by their own ratings), further the majority of those losses are the trigger pullers, not the supply, artillery, and other sorts of units.
Further of the wounded, a full third of them will be too severely wounded to return to the front lines.
Those highly trained and professional combat troops, whatever you rate them at, cannot be easily replaced without years and years of training, dedication, and motivation.
That be true of Ukraine, not Russia.
The conscripts Ukraine is roping in like cattle off the streets don't even want to go to war.