BBC Radio 4 Today: The state of Iran's nuclear weapons programme

The US Military has taken out highly enriched uranium at much higher levels in previous circumstances or in previous instances, but that was under very different circumstances. I'm thinking in particular of Project Sapphire in Kazakhstan, but that with the cooperative government, it took months to get that material out. We don't know how much of Iran's material is left, we don't know where it is exactly, we have an idea but we don't for sure, and this operation would presumably be happening under very difficult circumstances in the middle of a war zone."