Russia delivers first S-400 missile system to Turkey in challenge to NATO By Sarah Dadouch and Ezgi Erkoyun, Reuters / Jul 12, 2019
The US may suspend F-35 training for Turkish pilots over Ankara’s missile deal with Russia By Humeyra Pamuk And Phil Stewart, Reuters / May 29, 2019
Russia tried to send its most advanced air defense system to China last year. Then a storm got in the way By Christopher Woody, Business Insider / Feb 28, 2019