In pushing ahead with a new round of UN security council sanctions, the US has rendered redundant an Iranian offer to send 1.2 tonnes of low-enriched uranium (LEU) to Turkey for reprocessing as reactor fuel. Western diplomats claimed they had not rejected the idea, but it was clear to all what the effect of the UN resolution would now be. This is a mistake President Barack Obama may yet come to regret. True, this time, the US has Russia and China at its side, but neither country is risking much by going with the flow while taking the credit for diminishing its strength. The same is not true for Mr Obama, who has invested so much of his time and energy attempting to re-establish the primacy of US diplomacy over force. He will be seen by many to be walking away from the table at the very moment something appears to be on it.

