6 January 2016, 13:47 GMT
VIENNA (Sputnik) – “[CTBT Executive Secretary] Lassina Zerbo will immediately return from vacation to Vienna. Tomorrow afternoon a meeting is planned by the preparatory commission taking into consideration the upcoming UN Security Council discussion on this issue,” Vladimir Voronkov said.
Earlier on Wednesday, an earthquake occurred in South Korea, prompting Seoul's suspicions that Pyongyang had performed a nuclear test. North Korea subsequently confirmed that it had successfully tested a hydrogen bomb.