How can I ban a nation that's not currently in my region? I want two nations (Arcturuss and Limonpartei) banned from the United Emperies of Western Daf, but I can't because they've left.
You can't ban a nation that's not currently in your region. The only way to ban someone would be to eject them first, which can't happen if the nation's not there.
The only way to do this would be to keep a sharp eye out in case they move back in so you can drop the axe on them then, sorry.