- Russia delivers more air defense equipment to TurkeyReuters
- Turkey Gets Shipment of Russian Missile System, Defying U.S.The New York Times
- Turkey defies US as Russian S-400 missile defence arrivesBBC News
- 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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