Russian Foreign Minister Sergei Lavrov during a Moscow meeting with Executive Secretary of the Preparatory Commission for the Comprehensive Nuclear-Test-Ban Treaty Organization (CTBTO), Lassina Zerbo.

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Russian Foreign Minister Sergei Lavrov during a Moscow meeting with Executive Secretary of the Preparatory Commission for the Comprehensive Nuclear-Test-Ban Treaty Organization (CTBTO), Lassina Zerbo.

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Russian Foreign Minister Sergei Lavrov during a Moscow meeting with Executive Secretary of the Preparatory Commission for the Comprehensive Nuclear-Test-Ban Treaty Organization (CTBTO), Lassina Zerbo.

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Executive Secretary of the Preparatory Commission for the Comprehensive Nuclear-Test-Ban Treaty Organization (CTBTO), Lassina Zerbo, during a meeting with Russian Foreign Minister Sergei Lavrov at the Russian Foreign Ministry building, Moscow.

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Executive Secretary of the Preparatory Commission for the Comprehensive Nuclear-Test-Ban Treaty Organization (CTBTO), Lassina Zerbo, during a meeting with Russian Foreign Minister Sergei Lavrov at the Russian Foreign Ministry building, Moscow.

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Russian Foreign Minister Sergei Lavrov, left, and Executive Secretary of the Preparatory Commission for the Comprehensive Nuclear-Test-Ban Treaty Organization (CTBTO), Lassina Zerbo, meet at the Russian Foreign Ministry building, Moscow.

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Russian Foreign Minister Sergei Lavrov, left, and Executive Secretary of the Preparatory Commission for the Comprehensive Nuclear-Test-Ban Treaty Organization (CTBTO), Lassina Zerbo, meet at the Russian Foreign Ministry building, Moscow.

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