Russia seems to be hard, but you can win quite easily. Block the baltic sea with infantry and send most of the troops directly to Rostov and Chechnya. now the enemy will start sending his costly tanks into the baltic sea, where the cheap infantry will destory them. you just have to make sure that there are enough ships on the sea. if you conquered Rostov/Chechnya the enemy will start to produce troops in stalingrad and you can take leningrad... -> win
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