No, I am not being dense. From your continued lack of citations I am starting to assume there is no law stopping the RoK from enriching uranium (though I have been trying to find one). Uranium enrichment facilities are expensive. If you have a partner nation who is willing to sell you the enriched uranium that just makes sense. Again, it being the property of another nation, they have the right to judge who should have access it it and what they might do with it. If RoK wanted to spend a percentage of their GDP on enrichment facilities they could. They don't have an urgent reason to. Further they don't have any deposits of any uranium to begin with so they would still need to partner with another nation anyways, so I ask you - Why would RoK want their own enrichment facilities?