Except that those with nukes will never allow any country to develop one.

Taiwan tried to in the 80s and got immediately shut down when a scientist defected to the US and revealed the nuke facilities and that’s shut down by allies. And look at them now on the brink of being invaded - bet the scientists feels real fucking stupid.

Eventually it seems like developing nukes will be easy enough i secret that everyone will have them. Apparently it would take many countries like Japan only a year or so to develop nukes in an emergecy so I imagine in 20 years that number will be few months for most countries.