US looking at blocking sales of the F-35 to Turkey if they buy Russian s-400, and as of April after months of warnings, the U.S.stopped delivery of F-35 parts to Turkey in retaliation for Ankara’s decision to move ahead with the S-400.
Errr.... Are they not the ones that will overhaul the RAF engines?
https://www.defensenews.com/congress...35-for-turkey/