@Carolina:
I would like to add to answer 3, that if the capital that was captured is liberated, any of it’s territories that are in control of friendly powers, immediately go back the original owner. ie. Moscow is liberated by UK. UK controlled Livonia goes back to Russian control. See pg. 20 Capturing and Liberating Capitals, next to last para .
The OP’s questions are not regarding the capture of a capital, but rather the tournament rules for the political collapse of a power. Once a power suffers a political collapse, it is permanently out of the game.