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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Hydrogen bombs use hydrogen fusion to achieve the boom boom. The problem with that is that you have to put the hydrogen under a ridiculous amount of pressure before you achieve fusion.
What scientists found is that the easiest way to achieve the pressures necessary to kick off the fusion reaction is to use a fission explosion, hence the uranium.
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