Russian - In the later days of the war it was somewhat of a race between the allies to see who would reach Germany first. Communist ideology was the opposite, and thus the enemy, of facism. Not only that, but Stalin was an enemy of the capitalists. He would naturally look for ‘victories’ over the americans. Perhaps something could be added where, along with taking Germany, the USSR must do it without taking as many casualties as US/UK?
German - Hitler also used the war to extend his holocaust. Perhaps there is a way to incorporate his goal of creating a master race? Is there a possibility of S.S. units that could be used to eliminate ‘inferior’ beings? I.E. an S.S. unit in a german territory, instead of taking part in a battle, can be used to deport ‘inferiors’. Every deportation gains Germany 1 IPC (working in labour camps) and a S.S. marker is placed in the territory. To acheive a National victory Germany must have placed X S.S. markers in X territories.
Britain - Churchill was likely the most anti-communist man in power at the time. An additional condition could be to prevent the USSR from reaching it’s national victory.
Italy - Wouldn’t the Balkans fall under Germany’s goal of Lebensraum ?
Japan - What about America? Japan’s goal, should Midway have suceeded, was the invasion of hawaii and later the American Homeland.
USA - America wanted the USSR to enter the Pacific War - it was one of their main objectives during the Yalta conference. I’d think that the USSR occupying Japanese territory would be in accordance with their goals, not against. America’s strategy of ‘containing’ the Soviet threat was formed, to my knowledge, in the early stages of the Cold War and not during WW2.
It seems silly to set a single goal for each nation. There were always multiple goals they were working towards. Instead of putting one goal, perhaps multiple goals should be created and NVP (National Victory Points) assigned to each? Players must then concentrate on both team victory and a number of smaller concerns.