Which country is not a member of NATO?

CyanJaguar62, Finland too. However, the question was added before they both joined NATO

Player #120374466, North Atlantic is European South Atlantic is African

Montenegro shouldn't be allowed to belong to NATO, they sided against Austria - Hungary and Germany in World War l and are the bad guys !!

This explanation needs to be updated. Didn't Sweden join recently?

Many African countries were allies with the Soviet Union and now with Russia. That's why you won't see any, African countries on that list.

Player #25874027, then neither should turkey

As the coast of Congo is on the southern part of the Atlantic it doesn’t qualify for NATO membership