The Washington PostWhat is the Russian S-400 air defense system, and why is the U.S. upset Turkey bought it?Jul 17, 2019Siobhán O’GradyBy Siobhán O’Gradymore_vert
Foreign PolicyF-35 Sales Are America's Belt and RoadJul 12, 2019Jonathan D. Caverley, Srdjan Vucetic & Ethan B. KapsteinBy Jonathan D. Caverley, Srdjan Vucetic & Ethan B. Kapsteinmore_vert
CNNRussia starts delivery of S-400 missile system to Turkey, setting up standoff with USJul 12, 2019Kara Fox, Nick Paton Walsh & Ryan BrowneBy Kara Fox, Nick Paton Walsh & Ryan Brownemore_vert
NPRTurkey Accepts Russian S-400 Missile System, Rankling U.S. And NATOJul 12, 2019Bill ChappellBy Bill Chappellmore_vert
CNNTurkey bought Russian S-400 missiles designed to down NATO planes. For the US, that's a problemJul 13, 2019Tim ListerBy Tim Listermore_vert
DW (English)What is S-400 and why does Turkey want it?Jul 12, 2019Roman GoncharenkoBy Roman Goncharenkomore_vert