Policies may change but IAF or any other forces of India will never give access their mainstay products to any country. You have to know that there are no friends in International politics, only their interest exists.
I agree partly with you ...it was asked in context of Russia being not worried about FGFA since India-US are closer ...
But overall if you read history of world ...thing can change beyond imagination as future unfolds in curious ways ....
I said unlikely...but not impossible ...for same reason . You can't really predict future ...so need to keep options open and hence in diplomacy it is said ..." Never burn your bridges ...you never know if you will need one while travelling back ..when you are forced to retreat "