Ukraine, United Kingdom, Norway, Serbia, Montenegro, Albania, North Macedonia, Moldova, Belarus (once the idiot is dead), Russia (once the idiot is dead)
I don't understand why Norway isn't already in the EU.
Serbia, Belarus and Russia are a bad idea as their economies barely exist. We don't want to be supporting them as they try to climb out of the economic black hole of their own creation.
Ukraine: would be nice but it'd break the current farming subsidies program
United Kingdom: just a matter of time
Norway (and might I add Iceland and Switzerland): I'd love nothing more than this but we both know they won't for different political reasons. Never gonna happen under the current treaties.
Serbia, Belarus, Russia: fuck no
everyone else: as soon as they respect the Copenhagen criteria, sure
In 1987, Morocco applied to join the European Communities (the precursor to the European Union). The application was rejected on the grounds that Morocco was not considered to be a "European country" and hence could not join.