and then similar difficult diplomacy with America and the NATO Balkan states to consider integration.
There should probably be several events with difficult choices and loss of autonomy and independence in exchange for Albania, etc. Instead, it probably makes more sense with the situation of the time for an event chain following a successful Yugo+Bulgaria merger, like the first user suggested, where the Soviet Union demands ideological and other concessions from Yugoslavia in exchange for allowing it greater integration with the Soviet sphere.
With regards to commit 0573bd1, I'm m not sure the Balkan Federation should have formation mechanics like the other unions, especially since it's nearly impossible to get even a greater Yugoslavia to become a great power.
