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Turkey bought Russian S-400 missiles designed to down NATO planes. For the US, that's a problem | CNN
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This Infographic Provides Lots of Details about Russia's S-400 Advanced Air Defense Systems allegedly deployed to Syria - The Aviationist
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At the exercise near Samara, the column of S-400 Triumph air defense systems was closed to aerosols - ВПК.name
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Swedish Defence Institute Disparages S-400, Calls Russia 'Underdog' - 12.03.2019, Sputnik International
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