Iran\'s nuclear program talks, which were held Wednesday in Istanbul, made \"certain progress,\" Chinese Foreign Ministry Spokesperson Liu Weimin said. Liu said experts from the six world powers of the United States, Russia, Britain, France, Germany, China and Iran made their respective positions more explicit at the meeting, Xinhua news agency reported. \"The countries discussed Iran\'s nuclear program earnestly and made certain progress,\" Liu said. \"However, it is not unusual to see that a great deal of disagreement still remains, considering the complexity of the issue,\" he added. Liu said China hopes all sides will continue to carry out negotiations in a pragmatic manner and seek a comprehensive and long-term solution to the issue.