c'mon it's a easy bet that there's no way PLA would even want to get anywhere near Delhi, even if could. Once the altitude is just slightly lower they would run into dense population. Plus they knew if they do get too close that would give what Nehru wanted : a rescue situation with the US...
This is as old as...1962.
Nehru practically begged JFK to come in, playing the scenario that India was on the verge of collapse.
I believe he actually deliberately created the situation - put the Indian forces in bad situation to create the ruse to drag US in.
Appointing the wrong people...
no way AUS is actually going to spend that much. US will sell cheap or give away - AUS is basically going to be the American proxy & forward base of the upcoming throw-down on SCS if that happens.