(151102) -- GENEVA, Nov. 2, 2015 (Xinhua) -- International Telecommunication Union (ITU) Secretary-General Houlin Zhao (3rd L) and other delegates mourn for the victims of the recent Russian plane crash during the opening ceremony of the 2015 World Radiocommunication Conference in Geneva, Switzerland, Nov. 2, 2015. The World Radiocommunication Conference, the international treaty-making conference on radiocommunication, kicked off in Geneva on Monday. In session from Nov. 2 to 27, the conference will review the international regulatory framework for radiocommunications and revise them as needed. (Xinhua/Xu Jinquan)