Air defense in Tibet region, no matter China or India, are far harder than attacking.
During the whole 1980-2000s, IAF always sent Mig25 to Tibet sky freely, PLAAF almsot had nothing to deal with, this area is too huge.
Question is not about 1980-2000s era, and about Air defense in 2035. AWE can spot a fighter jet 350~400 km away, and Chinese can place Long range RF sensor is high altitude regions, rest depends on availability of J11/j16/j20.
Mig25 - IAF is able to use mig25, Mach 3.5+ jet freely becz, there is no SAM or interceptor is able to intercept mig25 at that time
''Air defense in Tibet region, no matter China or India, are far harder than attacking.'' - true unless China or India able use a large no.of AEW&C, also majority of aircraft become easy prey of manpads in Tibet region, limiting role of airforce.