The Iranian nuclear issue remained the most concerned topic on the second day of the Global Nuclear Security Summit. US President Obama expressed in the press conference held on the 13th that he hoped that the international community would "proceed boldly and swiftly" on the issue of a new round of sanctions against Iran. But Chinese Vice Foreign Affairs Minister Cui Tiankai said that the progress of the negotiation depended on the results of the consultation among all parties. He also emphasized that the sanctions against Iran should not affect the rights and interests of the countries that had economic and trade relations with Iran.