Nuclear weapons use the most purified uranium fuel (Mostly 236U). Fuel grade U, is less purified (60% 236). So if you want weapons, you want fuel grade U! Put it through a couple of centrifuges – and job done!
Fuel grade U goes through 18 centrifuges – so most of eh purifying work is done. The US is talking about exporting fuel grade U. This is like giving a loaded fire arm to a kid, and being surprised when they blow your head off!
We are never going to get any nuclear fission plants in the world. Molecular Nuclear Fusion from water is safe, clean and nearly free! Turing water into power – like nature does.
Nuclear fission is toxic, polluting and very, very expensive. And ends up being fatal.