UN Special Envoy for Syria Staffan de Mistura, left, during a meeting with Russian Defense Minister Sergei Shoigu in Moscow.

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UN Special Envoy for Syria Staffan de Mistura during a meeting with Russian Defense Minister Sergei Shoigu in Moscow.

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UN Special Envoy for Syria Staffan de Mistura during a meeting with Russian Defense Minister Sergei Shoigu in Moscow.

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Chief of the Main International Military Cooperation Department of the Russian Defense Ministry Major General Alexander Kshimovsky, Deputy Defense Minister Lieutenant General Alexander Fomin, Russian Defense Minister Sergei Shoigu and Deputy Foreign Minister Sergei Vershinin from left, during a meeting with UN Special Envoy for Syria Staffan de Mistura in Moscow.

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UN Special Envoy for Syria Staffan de Mistura, center, during a meeting with Russian Defense Minister Sergei Shoigu in Moscow.

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Russian Defense Minister Sergei Shoigu during a meeting with UN Special Envoy for Syria Staffan de Mistura in Moscow.

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Chief of the Main International Military Cooperation Department of the Russian Defense Ministry Major General Alexander Kshimovsky, Deputy Defense Minister Lieutenant General Alexander Fomin and Russian Defense Minister Sergei Shoigu, from left, during a meeting with UN Special Envoy for Syria Staffan de Mistura in Moscow.

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UN Special Envoy for Syria Staffan de Mistura, center, left, and Russian Defense Minister Sergei Shoigu, fourth right, during a meeting in Moscow.

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Russian Defense Minister Sergei Shoigu, right, and UN Special Envoy for Syria Staffan de Mistura during a meeting in Moscow.

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