The US and others could have stopped all centrifuges, taken all Iran's weapons grade materials, and ICBM tubes, gyros and engines and sold Iran at market prices all the power-plant-grade materials it needed. What they actually use in such venues, we would agree to replace. Boom! Their claims would be laid bare as if they weren't already. They're done. No nuclear weapons production agreed-to.
HF
The Bush Administration had the ability to act long before Obama got in there, but they didn’t. I wouldn’t expect the Obama Administration to be more stringent on Iran, so I don’t expect any meaningful action there. As far as the next administration, I don’t expect much either.