As I said, all the enmity stems from te border dispute. If borders were well defined and undisputed by both sides then there would never have been all this issues in the first place, so cooperation between both sides would have been normalized generations ago.There is an american/cia SIGINT base operating in India close to the Tibet border since the days of the Tibet liberation... I am not sure.
In fact, things were not as bad before the clashes in 2020. Since the dispute was shelved for sometime