“the holder of dual citizenship can certainly choose to renounce the one he does not actually want.”
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Certainly. My point, though, was that choosing to renounce one’s (foreign) citizenship may not result in an actual renunciation if the other country doesn’t permit it.
That leads to the odd but valid conclusion that any country can declare anyone in the world to be their citizen at any time, and there may be nothing the person can do about it.
Of course, if they ever try to exercise jurisdiction over that person against his or her will, they can expect to find themselves facing a very formidable enemy.
But every country is the ultimate decision maker on the question of who its citizens are.
Correct on all points.