Can the world prevent a nuclear attack? An interview with Lassina Zerbo | Talk to Al Jazeera

Live with Lassina Zerbo, Exec. Secretary of Vienna-based CTBTO

One-on-one with Executive Secretary of CTBTO, Lassina ZERBO

North Korean FM briefs Iranian president on regime's nuclear negotiations with U.S.

North Korean FM briefs Iranian president on regime's nuclear negotiations with U.S.

Nikki Haley On Iran Nuclear Deal: 'We Don't Want To Be Dealing With The Next North Korea'

Will Israel ratify the nuclear test ban treaty? Head of the UN body Dr. Lassina Zerbo weighs in

South Korean president says "No" to nuclear North Korea, nuclear South Korea

WATCH: Were North Korea to employ a nuclear weapon, it would be the end of the North Korean regime

North Korea to halt nuclear and ICBM tests, shut down nuclear test sites

Korea-Iran Summit analysis, Iran's position on nuclear Korean peninsula: On-set interview Prof. Seo Jeong-min of HUFS

North Korea Nuclear Test: Pyongyang conducts its biggest nuclear test

Top U.S. nuclear envoy arrives in Seoul to address North Korean nuclear threat

North Korea has started dismantling Punggye-ri nuclear test site: 38 North

North Korea capable of another Nuclear test says South Korea | Oneindia News

North Korea to shut down nuclear test site, unify Korean time zones

S. Korea and U.S. nuclear envoys emphasize coordination over North Korea

South Korea and Russia nuclear envoys meet, but differences on North Korea remain

North Korea nuclear test may be imminent: 38 North

North Korea has started dismantling Punggye-ri nuclear test site: 38 North

John Bolton on Iran, North Korea and 'accountability' for US wars | Talk to Al Jazeera

Korean Tensions: North Korea suspected of carrying out nuclear test

North Korea conducts fifth nuclear test: S. Korea defense ministry

South Korea, US, Japan envoys discuss North Korea nuclear concerns

North Korea conducts fifth nuclear test: S. Korea defense ministry

Residents of South Korea and Japan worry over North Korean nuclear threat