Why didn't Hitler leave Russia in 1942 when he knew he could not take it?

We know that in 1941 Hitler unsuccessfully invaded Russia and his armies did not capture Leningrad or Moscow. In the process he lost 1 million men. Why did he risk it again in 1942 .. instead he should have pulled out of Russia all together.. and strengthened his pre-war borders so that invaders would be repulsed.... show more We know that in 1941 Hitler unsuccessfully invaded Russia and his armies did not capture Leningrad or Moscow. In the process he lost 1 million men. Why did he risk it again in 1942 .. instead he should have pulled out of Russia all together.. and strengthened his pre-war borders so that invaders would be repulsed.

why didn't he?
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