Easily imaginable: every country with big enough nuclear arsenal could be viewed as a country holding the fate of the world in its hands.
But since there can be multiple such countries at the same time and since no one has stopped developing arms/tech even further - I wouldn't call it a paradox when one nuclear country feels threatened by another group of both nuclear and non-nuclear countries coming closer and closer to its borders.
The difference between a rational person and a narcissist is this: one recognizes the sufficiency of world-destroying power, the other will always demand more, regardless of the absurdity.
But since there can be multiple such countries at the same time and since no one has stopped developing arms/tech even further - I wouldn't call it a paradox when one nuclear country feels threatened by another group of both nuclear and non-nuclear countries coming closer and closer to its borders.