From: Zichron Yaaqov, Israel; Before, Treviso, Italy
I think something that should be included, and this could be easily modded to the existing game, is establishing & maintaining lend-lease support for the Soviet Union: the air bridge from Alaska to Siberia. During the war, thousands of single- and twin-engine aircraft were sent to the USSR via this air bridge. Bases to buildup, say to minimum airfield level 3, and some ports minimum 2, include Nome, Fairbanks, Anchorage, Whitehorse & Great Falls. Now why go to the effort? Failure to construct bases to these levels, and committing (engineer) resources to do this, by a given date should result in PP penalty. This would reflect negative Soviet feelings towards the US should the promised lend-lease effort not be attained. On the opposite hand, Japanese military action against any of these bases, resulting in interruption of the lend-lease flow, could result in accelerated Soviet activation against Japan. The existing game crudely models certain actions based upon real-world geo-political considerations of the time, primarily through the use of the PP system, so establishing and maintaining the lend-lease air bridge can easily be done, using existing resources in game, but new air base elements would need to be added to the database (Nome, for instance). Commence debate.
I like very much the general idea,
I think that anticipated soviet entry into war is more complicated than what you suggest, anyhow, yours is a possible addition;