A man watches TV reports of Japan's Chief Cabinet Secretary Yoshihide Suga's press conference on the suspected nuclear test by the Democratic People's Republic of Korea (DPRK), in Tokyo, Japan, Feb. 12, 2013. The DPRK said on Tuesday that it has successfully conducted a third nuclear test to safeguard national security against U.S. hostile policy, the official KCNA news agency reported. [Xinhua]