I agree, attacking Karelia is almost mandatory. But if the British station their fighters there as I mentioned above and the Russians crank out infantry then it should always hold. Building all tanks on Germany's first turn will be a big help.

. Even though germany had some cash at one point, and was able to buy units, they couldn't place them (I had taken over germany and southern europe at various points with UK and U.S. and burned their factories to the ground). It's hard to say how scorched earth affects the strategy. With Japan I kept the factory in Russia as I had enough troops to defend it.
. Russia builds nothing but infantry.
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