What does U1 provide?  Means to make nuclear weapons (?)   The stuff you dig out of the ground can be found in a lot of places.  You can't make nuclear weapons with it.  You can't even run a nuclear reactor with it unless you have a giant hard to hide production facility.   That won't even get you to a bomb.  You need another big hard to hide production facility.   Which is especially hard to hide when you have a civil war going on.