Turkish suppliers to be eliminated from F-35 program in 2020
"Turkey still has the option to change course. If Turkey does not accept delivery of the S-400, we will enable Turkey to return to normal F-35 program activities"
US stops accepting new Turkish pilots to train on F-35 fighter jets
However, according to sources, the possibility of a reversal of the decision is open if Turkey alters its plans
US denies willingness to talk over S-400 concerns with Turkey
US officials have suspended Turkey’s participation in the F-35 fighter jet program over the pending purchase