The Americans have already said that they cannot allow their F35 to coexist in the same arsenal as the S400 where it's weaknesses can be wargames and identified, they have cancelled Turkey's contract in this regard.This seems more plausible.
The Americans may let Pakistan have our say in Afghanistan but India is an important cog in the wheel in its "Indo-Pacific" strategy.
With China already way ahead of India in the 5th generation game, F-35 will be presented to India as a good counter.
India can also balance its S-400 and Rafael purchase with a F-35 deal to assuage the Americans.
Can someone tell me why they would make an exception in India's case.
Answers on a postcard please.