And? For the average country, the difficult thing about nuclear weapons is not how to build one (pipe with two halves and a bit explosives is enough for a few kt) but to get enough Plutonium. You know, the whole thing with Israel running secret facilities with ceramic centrifuges for years. What US and China are wasting a few MW computer center each year on, is getting a bit more out of it than the competition, especially fusion weapons. Seen rationally, it's a childish "i have the bigger ~~dick~~ boom".