4-If China decide to invade India...
A friendly advice to you -> if China invades India, for your own personal safety, I'll advise you (and your family members) to move to Lhasa or Xinjiang. Those would be the safest places left for you to run to. If not, you would be at risk of finding a bright sunny day sky turning "purple", right above your head.
No offence intended, but I did say "If China invades India .....", quoting you.
Prior to that, "if" your govt decides to invade India, try to change your govt for the sake of your life and that of your family.
Agreed, it will be unfortunate for us, if China invades us. India propragates peace and mutual prosperity. We are discussing Aksai Chin for a peaceful settlement. But if you think you are going to change borders by force, then first move out all the concentrated high value assets in Shanghai otherwise they are also under risk.
While invading India, if you think it's just another Vietnam or Phillipines, please feel free (at your own peril). If you believe that it's going to be a border skirmish (like 1962), you are again mistaken. And then, you are further losing time in your "invasion" since nuclear subs for effective second strike ability are in the making. Take your risks and make your (mis)calculations if you insist on under-estimating India's nuclear deterrence. I can assure you, that you'll be more than sorry for those miscalcuations later.
Talking of 1962, if you think you can have a repeat then I must say the probability is same as Japan trying to repeat a "Pearl Harbor" or the possibility of Japan raping Nanking once again.
It's not 1962, and we're not talking about fighting on roads along the border (feel free to keep pouring money into them, no issues), but about counter-attacks against the heartland of China's economy. Be prepared to defend all that you value so much.
Let better sense prevail on your rulers in Beijing, otherwise I can tell you it's going to be bad for everybody.