The thing people don't realize about nukes is that you don't just build them once and bob's your uncle, you have a nuclear bomb forever. The material starts to decay and the potency of the bomb is then greatly diminished. Nukes must be maintained to keep them operational. In fact, I know westinghouse would buy old unspent weapon's grade material, and then refine/dilute the material to convert into fuel rods for nuclear power plants. Given the war, I don't know if that's still the case.

But yeah, nukes take a lot of effort and resources to maintain as far as I understand it.