Can EU diplomacy stop Iran's nuclear programme?

When Iran restarted its nuclear programme in August 2005, it seemed to obliterate two years of EU efforts to persuade Tehran not to build a nuclear bomb. However, Mark Leonard argues that the EU should persevere with diplomacy. It should try to slow down the nuclear programme until there is a new regime in Tehran that is willing to make concessions in return for western aid and trade.
Mark Leonard was director of foreign policy at the CER (2005-2007).