The government of North Korea conducts its fifth and reportedly biggest nuclear test. World leaders condemn the act, with South Korea calling it "maniacal recklessness".

North Korea, officially the Democratic People's Republic of Korea (DPRK), is a country in East Asia. It constitutes the northern half of the Korean Peninsula and borders China and Russia to the north at the Yalu (Amnok) and Tumen rivers, and South Korea to the south at the Korean Demilitarized Zone…