We played Star Fluxx, Star Munchkin, Dixit, and, of course, Bomb Alley.
How do enemy units affect supply? I'm trying to find that in the English rules and it seems to me there's no clear answer.
XI.1 Supply bases says:
All towns that are worth VP's are supply bases, even if they have no garrisons. Such towns cannot be a supply base if there is no connecting line between this town and Warsaw (for Poles) or Soviet special locations (for Soviets).
Since all towns on the map are ultimately connected with Warsaw on one hand and Klincy etc. on another, looks like the following clarification should be present: "enemy units block connecting lines for purpose of supply."