Images of Vienna's Palais Coburg, which is hosting talks on the Iranian nuclear deal. The European Union, which is coordinating the indirect talks between Washington and Tehran, has confirmed the negotiations have resumed after a break of a few days. Americans and Europeans alike accused the Iranians of having backtracked since the spring. ashington has warned it will not let Tehran block negotiations for much longer while developing its nuclear program at the same time, but has not yet laid out an ultimatum. IMAGES