Governments around the world have condemned North Korea for conducting its third nuclear test since 2006. Pyongyang confirmed the test hours after seismic sensors registered a possible underground explosion.
North Korea ramped up its nuclear threats, boasting of its ability to deliver miniaturized warheads on high-precision long range rockets - an unbelievable claim, as nuclear scientist Siegfried Hecker tells DW.
US Secretary of State John Kerry has assured South Korea of "ironclad" support from the US on a trip to Seoul. He demanded the North restart talks on its nuclear program, calling Pyongyang's recent conduct "horrific."
As the communist state cancels a visit by UN Secretary-General Ban Ki-moon, its National Defense Commission has announced new nuclear warhead capabilities. But experts warn the claim might merely be propaganda.
North Korea has reportedly executed its defense minister for falling asleep at an event attended by leader Kim Jong Un. More than a dozen senior officials have been executed since the start of the year.