Yeah, its too many special rules in this game. It should be none. Looks like the designers want us to be Hitler, Churchill and Stalin and strict follow their historical correct path in something that looks like a scripted game. This is bad. When I play Germany I dont want to mimic Hitler and his mistakes, I want to rule Germany as king Steven Narvik, the new emperor, and I want to attack and conquer Spain, Turkey and my arch enemy Italy. But, the derogatory Rulebook deny me that, and force me to go the historical correct way.
Mongolia should have IPC income, like everybody. China should have factories, planes, ships and no special rules. If the Russian player dont want Japan to move into Mongolia, then the Russian player need to place a stack in some adjacent territory. Not point at the Rulebook, as he do today. No treaty was ever worth the paper they were written on. The arms always did the talking.