My friend, if I may, I would like to make two small corrections: First, Turkiye was not a F-35 buyer, but a part of the JSF program with about 10 companies. Even when Turkiye's jets were not delivered, these companies continued to supply subsystems to the program (for both aircrafts and engines) for two more years. In fact, deliveries in the last year were twice as high as in the previous year. The program was expected to provide more than $10 billion to the Turkish aviation industry, and one of the two main non-US maintenance bases for the F-35 jet was to be located in Izmir. Turkiye has only achieved about half of these economic gains and, naturally, the Izmir maintenance base has not become operational. However, this project has been of great support in establishing almost the entire infrastructure in Turkiye, from the production to the operation of this aircraft in connection with the JSF program.
The other issue is the S400-F35 relationship. This is purely a political lever. It is not a technically consistent justification. The planes in question have already been used many times as a hostile power in airspaces protected by the S400. And the fact that India is now officially negotiating shows that US officials recognize that they can be coordinated within the same armed forces in two separate air-tactical control networks, which was the main argument against Turkiye. The Turkish side had previously presented the technical documentation and how the operation would take place to its counterparts with extensive documentation and simulations.
There is currently an election process in our country and one of the main promises of some of the opposition bloc is to buying F-35. In fact, even this shows that the issue is more on the basis of conflict of interest.
In short, India's position vis-à-vis China is seen as valuable to the US and the way forward for the F-35 purchase seems to be open if Indian officials accept "some" US "conditions".
It's not related but if you ask about our situation, we have a big surprise on March 18th.