- Turkey Receives Russian Missiles Opposed by U.S.Bloomberg Politics
- Russia starts delivery of S-400 missile system to Turkey, setting up standoff with USCNN
- Turkey Gets Shipment of Russian Missile System, Defying U.S.The New York Times
- S-400 arrives in Ankara: Crunch time for Turkish foreign policyAl Jazeera English
- What is the Russian S-400 air defense system, and why is the U.S. upset Turkey bought it?The Washington Post
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