Maybe this has already been answered, but upon the completion of Stalin's purges and the firing of the civil war, the game just ends. I didn't select an option for 2 of the 3 decisions, and when the coup message comes up, the game just ends. My only options are to quit or observe. At that point I can play as the tzarists but have lost most of the officers and all of my research progression. Annexing the monarchists doesn't prevent this from happening either. Is this supposed to happen? I don't feel like spending 40 minutes to find out and try something else.