Russia’s Federal Service for Military-Technical Cooperation has confirmed to Interfax on Sept. 12 that Turkey has signed a contract to buy the S-400 air defense missile system.
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By ru:Участник:Goodvint (Own work) [GFDL or CC BY-SA 3.0], via Wikimedia Commons
Turkish President Recep Tayyip Erdogan earlier disclosed that the deal was sealed and a deposit had been paid.