According to Yonhap News, North Korea has successfully conducted its third nuclear test. This test was conducted in a secure underground facility using a "miniaturized nuclear device with greater explosive force". Continue reading for the news report and more information.
North Korea claims that the test was its "first response" to perceived U.S. threats, and they warn it will continue with unspecified "second and third measures of greater intensity" if the United States maintains its hostility. Andrei Lankov, a North Korea expert, told Fox News that the possession of such a "miniaturized" device would be necessary to create a nuclear warhead.
[Sources 1 | 2]