You are ignoring the minor fact that every one of your cheap, mass produced tanks that is destroyed kills a valuable, hard to replace three or four man crew. You can't replace killed infantrymen, tank crews are harder to replace than cannon fodder draftee infantrymen. Since you are embargoed, you can't build tanks more sophisticated than WWII T-34s or IS IIIs since your electronics uses foreign components that you can't produce. The tanks you have are communist designed garbage and your ballyhooed T-14 Armata can't be produced.