They wont. That would involve low level commanders doing independent decisions. That's not their style, as dictatorship will fail then. Modern warfare started with Carl von Clausewitz "On War". Germans started it with Second and Third Reich, then Amercians and NATO adopted and improved on that, then Ukraine surprised Russians by having adopted it too.

Also, there are big industrial problems with their manufacturing. Their factories rely on Western tech to produce tanks, etc. Sooner or later they will start to fail. As Russians don't have their own tech for that.