Iran and six world powers have agreed to a four-month extension of negotiations on a nuclear deal with Tehran after failing to meet a July 20 deadline due to “significant gaps” between the two sides, the European Union and Iran said on Saturday. “There are still significant gaps on some core issues which will require more time and effort,” EU foreign policy chief Catherine Ashton and Iranian Foreign Minister Mohammad Javad Zarif said in a joint statement, the Reuters news agency reported. Iran, the United States, Britain, France, Germany, Russia and China had set a July 20 deadline to complete a long-term agreement that would resolve the decade-old dispute over Tehran’s nuclear ambitions. But diplomats said they were unable to overcome significant differences on major sticking points. “We will reconvene in the coming weeks in different formats with the clear determination to reach agreement on a Joint Comprehensive Plan […]