what stops countries from secretly developing nuclear weapons?

Question

What I mean is that nuclear technology is more than 60 years old now, and I guess there is a pretty good understanding of how to build nuclear weapons, and how to make ballistic missiles. So what exactly stops countries from secretly developing them in remote facilities?

In: Other

Answer 1

The US bombing everyone who’s tried. Or developing some of the most advanced malware on the planet to destroy your refinement process.