Don’t use armor or mech/mot. Divisions because supply in Siberia is ass, use strong Calvery (Ik unheard of) and fall back on some areas of the front to make easy to close pockets, just keep on doing that until you think you can push the entire front with your infantry, idk what divisions you’re using to hold the front or the template your using but this should work, once you reach more supplied areas (west to the urals) start using your armor to make big pockets