400s
Selling F-16s to Turkey as they buy new S-400s from Russia is a mistake – Analysis
Why would the Biden Administration push ahead with an F-16 sale to Turkey when they will also buy from Russia additional S-400s?
Turkey – US relations improvement unlikely under Biden, former US envoy Jeffrey says
“The S-400s are a disaster for Turkey… Purchasing them was a historic mistake”
Turkey to test Russian S-400 systems despite US pressure, media reports say
Turkish F-16 warplanes will fly over the country's capital Ankara on Monday to test its new Russian S-400 missile defenses, Turkish media said, despite pressure from Washington for Turkey to drop the system.