North Korean leader Kim Jong Un claps during a celebration for nuclear scientists and engineers who contributed to a hydrogen bomb test, in this undated photo released by North Korea's Korean Central News Agency (KCNA)

North Korean leader Kim Jong Un claps during a celebration for nuclear scientists and engineers who contributed to a hydrogen bomb test, in this undated photo released by North Korea’s Korean Central News Agency (KCNA)

North Korean leader Kim Jong Un claps during a celebration for nuclear scientists and engineers who contributed to a hydrogen bomb test. Photo: KCNA via Reuters

September 12, 2017 2:51 AM (UTC+8)