US says “window narrowing” for Turkey to address standoff over Russian missiles
Senior US official says that S-400 acquisition "challenged membership in NATO"
Majority of F-35 supply chain will be out of Turkey by March
This shows the US is serious about removing Turkey from the F-35 program because it acquired the Russian S-400
Turkish F-35 parts producers mull Bulgaria move to sidestep sanctions
Turkey was suspended from the F-35 program after receiving its first shipment of Russian S-400 missile systems in July 2019
