As nuclear talks remained deadlocked, the EU confirmed plans for a full embargo of Iranian crude oil exports commencing July 1. The latest round of negotiations with Iran over its nuclear program ended without agreement or plans for further meetings and EU foreign-policy chief Catherine Ashton says the gap between the two sides is "extremely wide." Will the latest economic sanctions force Iran back to the bargaining table? We asked veteran Iran watcher, Michael Alder to explain the latest developments.