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We're talking about nukes because nukes guarantee that no war will broke out between nuclear powers. There won't be war between NATO and Russia due to MAD if Ukraine still had her nukes she inherited from the Soviet Union - instead of the paper guarantee from NATO - we wouldn't have this excellent war. So basically this way we can rule out participants in military conflicts, and look around for possible enemies. And whatever EU would need to face in the hypothetical scenario above, for that she wouldn't need that big of an army.