My despairing feeling is that, in the case of Iran, we should admit that it's checkmate, as they say in Persian. The Iranians are one day going to possess a nuclear bomb; there is almost certainly nothing we can do about it; all our blustering and threats are pointless. Indeed, if all else fails, there may even be a case for giving the Iranians the bomb — that's right: maybe it is time for the Americans to take control themselves of this unstoppable programme.