Perhaps you are making the same mistake the German High Command made. Underestimating the amount of divisions which Soviet Union was be able to raise and in the amount of time that she was able to do so?

Example: In the last 67 days of AGC advance, she sustained more then 200,000 casualties while receiving no replacements. At the same time the Soviets were able to mobilize over 50 new divisions.

I would imagine that the Japanese would end up facing the same problem......

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The war against Russia will be such that it cannot be conducted in a knightly fashion. This struggle is one of ideologies and racial differences and will have to be conducted with unprecedented, unmerciful and unrelenting harshness. -Adolf Hitler