US Secretary of State Condoleezza Rice said Wednesday that Iran has given a "disappointing and incomplete" response to an international deal to end suspicious nuclear activities and said world powers may have no choice but to haul Iran before the UN Security Council. Iran ruled out responding this week to international incentives to suspend its nuclear program, dashing any hope that the regime would meet a Wednesday deadline on a six-nation offer intended to dissuade Iran from uranium enrichment. "The indications are that Iran's response has been disappointing and incomplete," Rice told reporters aboard her flight from Washington to Paris early Wednesday. "If that is indeed the case, we've always said we were either on the path to negotiations or we're on the path to the security council." Foreign minister from the six countries that made the proposal - the five permanent members of the security council plus Germany - were meeting Wednesday in Paris. The six are pushing for an agreement before world leaders meet this weekend in Russia for the Group of Eight summit of leading industrial democracies.