Russian Defence Minister Sergei Shoigu, right, during a meeting with Serbian Prime Minister Aleksandar Vučić in Moscow.

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Russian Defence Minister Sergei Shoigu, center, during a meeting with Serbian Prime Minister Aleksandar Vučić in Moscow.

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Serbian Prime Minister Aleksandar Vučić during a meeting with Russian Defence Minister Sergei Shoigu in Moscow.

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Russian Defence Minister Sergei Shoigu's meeting with Serbian Prime Minister Aleksandar Vučić in Moscow.

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Russian Defence Minister Sergei Shoigu's meeting with Serbian Prime Minister Aleksandar Vučić in Moscow.

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Russian Defence Minister Sergei Shoigu, right, and Serbian Prime Minister Aleksandar Vučić during a meeting in Moscow.

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