"Condemn #DPRK #nuclear test in strongest terms. This is not only a clear violation of Northkorea's intl obligations but also a reckless & irresponsible act in times of heightened tensions on Korean peninsula. #DPRK must stop unilateral provocations & return to negotiations. Call for swift #UNSC reaction," Kurz posted in its Twitter blog.
Earlier in the day, North Korea claimed it had successfully conducted a test of hydrogen bomb, local media reported.
An estimated capacity of North Korea's nuclear test may have reached 50 kilotonnes, South Korean media reported on Sunday.
More about: #OSCE #North-Korea
