As far as I know, access to uranium is tightly controlled for obvious reasons, but hydrogen is everywhere, and even getting access to deuterium shouldn’t be too hard.
There is also the fact that most modern thermonuclear bombs “only” use the fission bomb to trigger the hydrogen bomb.
People demonstrate achieving fusion all the time. The problem is getting useful energy out of it. When building a bomb, we don’t really care about useful energy; we just want to release a lot of it.
So why aren’t people building purely fusion based thermonuclear weapons left and right?
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We’re only able to achieve fusion at all with the use of hugely powerful lasers, requiring massive amounts of energy. Currently, there’s no way to pack that kind of gear into a warhead. Fission is relatively compact.
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