1st – the fuel. This is hard and other countries can figure out what you’re doing.
2nd – its not enough to make a nuke like the big fat unyeldy ones that the US dropped in japan with a big fat bomber. These days you couldn’t basically deliver it without getting shot down. You have to make one small enough to fit on a missile.
3rd – You also need a decent missile, with range, enough precision, and very reliable. You don’t want it breaking up over your country while carrying a nuke, right?
These are not trivial problems.
What *is* happening is that countries are reaching the conclusion that in order not to be regime-changed, threatened or interfered with in disregard of international laws, they should have this threat in their arsenal. That is driving demand for these weapons, and making the world far more dangerous.
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