GENEVA (Reuters) – An agreement that would open the door to a resolution of the decade-long nuclear standoff between Iran and six world powers is possible this week if negotiators exert the maximum efforts, Iran’s foreign minister said on Thursday. “If everyone tries their best we may have one,” Iranian Foreign Minister Mohammad Javad Zarif told reporters after a breakfast meeting with European Union foreign policy chief Catherine Ashton. “We expect serious negotiations. It’s possible,” he said when asked if an agreement was conceivable at Thursday-Friday talks between Iran and the five permanent U.N. Security Council members and Germany. (Reporting by Fredrik Dahl, Justyna Pawlak, Louis Charbonneau)