Haleu fuel is pretty common that’s enriched up to about 20%. Highly enriched fuel is still used for nuclear power on aircraft carriers that use 93% enriched U235.

Iran is definitely just trying to make weapons but wanted to at least give some examples of higher enriched fuels

It’s a big issue everywhere, Japan in particular has it worse than others because of their robust social support network so you need a large working population to be able to fund it and due to their shrinking population funding social services their deficit has been increasing and is reaching a bad point where their deficit is around 2.5x their GDP so they are going to bury their future already shrinking population in debt