Vienna, 2 May 2017

On 2 May 2017, CTBTO Executive Secretary Lassina Zerbo delivered the following statement to the 2017 Preparatory Committee (PrepCom) for the 2020 Review Conference (RevCon) of the Parties to the Treaty on the Non-Proliferation of Nuclear Weapons (NPT).

The 2017 NPT PrepCom, which runs from 2 May to 12 May at the Vienna International Centre, is the first of three sessions that are scheduled to be held leading up to the 2020 NPT RevCon. At the three PrepCom sessions, States parties to the NPT, will discuss substantive and procedural issues relating to the Treaty and the 2020 NPT RevCon. The Chair of the 2017 NPT PrepCom is Ambassador Henk Cor Van der Kwast of the Netherlands. In the opening session, distinguished speakers including Japanese Foreign Minister Fumio Kishida, underlined the vital importance of an in-force CTBT in the NPT context.

Widely regarded as the cornerstone of the nuclear non-proliferation regime, the NPT (PDF) opened for signature in 1968, entered into force in 1970, and was extended indefinitely at the 1995 NPT RevCon. Based on three pillars (non-proliferation, disarmament and peaceful uses of nuclear energy), the NPT was negotiated to prevent the spread of nuclear weapons, to further the goals of nuclear disarmament and general and complete disarmament, and to promote cooperation in the peaceful uses of nuclear energy. NPT Review Conferences take place every five years (the last RevCon was in 2015), and a PrepCom session takes place on each of the three years preceding a RevCon.

Read the Executive Secretary’s Statement here (PDF).

Posted by: ctbtonewsroom | April 27, 2017

MEDIA ADVISORY: Joint Appeal by Japan, Kazakhstan, CTBTO

Vienna, 27 April 2017

On 2 May 2017, CTBTO Executive Secretary Lassina Zerbo will be joined by Japanese Minister of Foreign Affairs Fumio Kishida, and Kazakh Ambassador and Permanent Representative Kairat Sarybay to issue a joint appeal by the foreign ministers of Japan and Kazakhstan, and CTBTO, on the Comprehensive Nuclear-Test-Ban-Treaty on the occasion of the meeting of the 2017 Preparatory Committee for the 2020 NPT Review Conference in Vienna. The appeal will be preceded by a bilateral meeting between Minister Kishida and the Executive Secretary.


  • Photo opp: CTBTO Executive Secretary’s office (E0754): 14:55
  • Media stakeout: E 702: 15:10. Media representatives are requested to arrive by 15:00 to set up.
  • Following the stakeout, a recording and photographs will be made available via CTBTO’s website and Flickr page.

Media representatives wishing to participate in the media stakeout are requested to register by emailing Journalists with permanent accreditation to the VIC need no further credentials. All others must seek accreditation (contact Veronika Crowe-Mayerhofer (+43-1) 26060-3342 Accreditation will be at the Gate 1 entrance to the VIC.

The CTBT bans all nuclear explosions, thus hampering both the initial development of nuclear weapons as well as significant enhancements. The Treaty also helps prevent damage caused by nuclear testing to humans and the environment.

The CTBT has so far been signed by 183 States and ratified by 166. Its entry-into-force formula prescribes that 44 particular “nuclear technology holder” States need to ratify for it to enter into force. Eight of them have yet to ratify: China, the Democratic People’s Republic of Korea (DPRK), Egypt, India, Iran, Israel, Pakistan, and the United States (the DPRK, India and Pakistan have also not yet signed the Treaty).

A verification regime to monitor the globe for nuclear explosions is nearing completion with around 90 percent of the 337 planned International Monitoring System (IMS) facilities already in operation (see interactive map).

For further information on the CTBT, follow us on Twitter and please see – your resource on ending nuclear testing, or contact:

Elisabeth Wächter
Chief, Public Information
T    +43 1 26030-6375
M    +43 699 1459 6374

CTBTO Executive Secretary Lassina Zerbo and Deputy Foreign Minister of the Russian Federation Sergei Ryabkov use the current concerns about North Korea’s nuclear weapons as a starting point to remind the international community of the need to strengthen diplomatic efforts towards nuclear non-proliferation. An essential part of this effort with near to universal support is the Comprehensive Test Ban Treaty (CTBT) which verifiably bans all nuclear weapon test explosions.

CTBTO SEPTEMBER 23_12.JPGCTBTO has established an effective International Monitoring System (IMS) to verify compliance to the Treaty. The system is already detecting and deterring nuclear explosive tests with its 302 completed detection facilities  in over 90 countries. “Certainly, all countries, including the United States and the rest of the remaining states, have benefited from the ban on nuclear testing established by the treaty. But without ratification of the nuclear test ban treaty by Washington and other key states, the door to the resumption of nuclear testing remains open, and the long-term legal and operational basis of the treaty, and international nuclear non-proliferation and disarmament regime as a whole, cannot be considered complete and effective.”

The CTBTO is also still working under “provisional” operations: “The full capabilities of the verification regime including monitoring system and on-site inspections, are not yet available because the treaty has still not formally entered into force, which requires 44 named countries possessing nuclear technology in 1996 to ratify the Treaty. Eight key states — the United States, China, Egypt, Iran and Israel — still need to ratify the nuclear test ban treaty, while North Korea, India and Pakistan, also need to, but have not yet signed it.” Lassina Zerbo and Sergei Ryabkov point out how the nations who still have to ratify the Treaty would benefit from its ratification, easing regional tensions and demonstrating leadership in nuclear issues. “The nuclear test ban treaty is too important to slowly fade away. The world will be a far more dangerous place if states resume nuclear testing.”

Read the full article here

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