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Nuclear test ban treaty preparatory commission head

Robert Floyd, head of the preparatory commission for the Comprehensive Nuclear Test Ban Treaty Organization, speaks during a press conference at the Japan National Press Club in Tokyo on Aug. 5, 2025.

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Nuclear test ban treaty preparatory commission head

Robert Floyd, head of the preparatory commission for the Comprehensive Nuclear Test Ban Treaty Organization, speaks during a press conference at the Japan National Press Club in Tokyo on Aug. 5, 2025.

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CTBTO head in Tokyo

Robert Floyd, executive secretary of the Comprehensive Nuclear-Test-Ban Treaty Organization, speaks during a press conference at the Japan National Press Club in Tokyo on Jan. 19, 2023.

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CTBTO head in Tokyo

Robert Floyd, executive secretary of the Comprehensive Nuclear-Test-Ban Treaty Organization, attends a press conference at the Japan National Press Club in Tokyo on Jan. 19, 2023.

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CTBTO head in Tokyo

Japanese Prime Minister Fumio Kishida (R) holds talks with Robert Floyd, executive secretary of the Comprehensive Nuclear-Test-Ban Treaty Organization, at the premier's office in Tokyo on Jan. 19, 2023.

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CTBTO head in Tokyo

Japanese Prime Minister Fumio Kishida (R) shakes hands with Robert Floyd, executive secretary of the Comprehensive Nuclear-Test-Ban Treaty Organization, during a meeting at the premier's office in Tokyo on Jan. 19, 2023.

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CTBTO executive secretary

VIENNA, Austria - Comprehensive Nuclear Test Ban Treaty Organization Executive Secretary Tibor Toth speaks during an interview with Kyodo News in Vienna on Feb. 12, 2013.

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New nuclear test monitoring system

VIENNA, Austria - Lassina Zerbo (C), executive secretary of the preparatory commission for the Comprehensive Nuclear-Test-Ban Treaty Organization, and Toshiro Ozawa (R), ambassador at Japan's permanent mission to the international organizations in Vienna, attend a tape-cutting ceremony during an event marking the launch of a new system to detect radioactive substances from nuclear tests in Vienna, Austria, on Nov. 26, 2013. The new system for Atmospheric Transport Modeling has been installed at the headquarters of the preparatory commission through Japan's contribution of around $737,000, according to the commission.

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N. Korea sought to attend ministerial meeting on nuclear test ban

Lassina Zerbo, executive secretary of the Preparatory Commission for the Comprehensive Nuclear Test Ban Treaty Organization, gives an interview to Kyodo News in Vienna on Jan. 18, 2016. Zerbo expressed his intention to invite North Korea to the ministerial-level meeting to be held sometime between April and June in the Austrian capital to commemorate 20 years since states began signing the treaty. (Kyodo) ==Kyodo

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CTBTO chief sees Hiroshima meeting as new starting point

Lassina Zerbo, executive secretary of the Preparatory Commission for the Comprehensive Nuclear Test Ban Treaty Organization, speaks in an interview in Hiroshima on Aug. 24, 2015, describing the western Japanese city's hosting of a two-day meeting of the Group of Eminent Persons for the CTBT as a new starting point. Hiroshima is one of two Japanese cities devastated by U.S.-dropped atomic bombs in World War II. (Kyodo) ==Kyodo

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Hiroshima mayor addresses group of eminent persons for CTBT

Hiroshima Mayor Kazumi Matsui addresses a meeting of the Group of Eminent Persons for the Comprehensive Nuclear Test Ban Treaty Organization in the western Japanese city on Aug. 24, 2015. (Kyodo) ==Kyodo

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U.S. ex-defense chief addresses group of eminent persons for CTBT in Hiroshima

Former U.S. Defense Secretary William Perry addresses a meeting of the Group of Eminent Persons for the Comprehensive Nuclear Test Ban Treaty Organization in Hiroshima, western Japan, on Aug. 24, 2015. (Kyodo) ==Kyodo

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CTBTO Executive Secretary Zerbo speaks to Kyodo News in Nagasaki

Lassina Zerbo, executive secretary of the Preparatory Commission for the Comprehensive Nuclear-Test-Ban Treaty Organization, speaks to Kyodo News at a hotel in Nagasaki, on Aug. 8, 2015. A senior Chinese official told the commission earlier this year that Beijing's ratification of the pact is not dependent on Washington ratifying it, according to Zerbo. (Kyodo) ==Kyodo

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Hiroshima high school girl speaks at CTBT symposium

Photo taken Jan. 26, 2016 shows Shizuka Kuramitsu, a high school student from Hiroshima invited to a symposium organized in the Austrian capital by the Preparatory Commission for the Comprehensive Nuclear Test Ban Treaty Organization. (Kyodo) ==Kyodo

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Ex-CTBTO chief visits Hiroshima for CTBTO meeting

Wolfgang Hoffmann, the first executive director of the Preparatory Commission for the Comprehensive Nuclear Test Ban Treaty Organization, speaks to Kyodo News on Aug. 25, 2015, in the western Japanese city of Hiroshima where he attended a meeting of the CTBTO's Group of Eminent Persons. (Kyodo) ==Kyodo

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U.N. General Assembly meeting

Lassina Zerbo, executive secretary of the preparatory commission of the Comprehensive Nuclear-Test-Ban Treaty Organization, delivers a speech at a U.N. General Assembly meeting in New York on Sept. 6, 2018. (Kyodo) ==Kyodo