The russians have it the easiest because they have production centers everywhere, and they have the most rail capacity.
The Results of the game at FenCon VI - The Allies in Spring 42
The tension level rule where Russia gains a card at the end of their turn is to strong, needs to be modified or dropped.
This enabled the Russians to attack on turn 8, the same turn as US (fantastic card draw for US player). This decimated the german forces in the east, and took a lot of heat off the brits, who were struggling to hold Cairo, Gibraltar, and the Homeland.