@mist_consecutive Y-20 make sense if the Chini paratroopers were travelling to Ladakh from Chini plains. But the acclimitzation of Chini paratroopers will be in some high altitude area (Golmud maybe? its near high altitude area). From Golmud to Ladakh will not require Y-20. Y-9 is better suited. This is because Y-9 will be able to deposit the paratroopers in LZ faster than Y-20 would (based on a study between C-17 and C-130J).
Now assuming that we are unable to stop the paratroopers from landing. Our AEW&CS will still likely detect the airdrop.
The bigger question is what will be the objective of such an airdrop? Airborne will get slaughtered unless they get deployed right behind some Indian formation and then attempt to cut off reinforcements to us while a sizeable PLAGF formation attacks this Indian formation. That alone will be a declaration of war. The only area I can see such a push succeeding is near Demchok or behind Gogra post (cutting it off from Lukung and Phobrang).
But unless the PLAGF attack Demchok and Gogra and manage to link up with the PLAAF airborne, the airborne are likely to get slaughtered by our reinforcements. So if the PLA attempts airborne assault, it will be war.
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BTW, we are so focused on the lake areas that I don't hear any news regarding other posts along Ladakh-Tibet border. What is Chini strength opposite Gogra, Demchok and on Depsang?