You know that there is a huge disgruntlement against the central government in the North east.The government of India has constantly failed the people of North east for the past 50 years.Five decades of insurgency & conflict has simply dispirited the people of North East.This issue combined with general lack of affinity towards the rest of India because of the huge racial and cultural difference can be exploited by the Chinese. India's suffers from a geographical curse called as chickens neck or that 22 km narrow siliguri corridor that connects North east to the rest of the country.Anybody cutting that neck would result in India loosing the entire North east. Besides the fact that India has a very hostile Bangladesh as well as Nepal ,both lusting for their pound of flesh in Assam and Uttranchal respectively.So it's useless to think that incase of any Chinese invasion they would help India or even stay neutral,rather expect them to work hand in gloves with the Chinese. Now looking at India's bleak preparedness. India neither has the military strength nor any financial capability,nor the industrial power or the requite infrastructure to take on China.On the top of that India does not even posses any basic minimum deterrence.With a nuke bomb of a yield strength of merely 30-40 kt ,it is no match for a Chinese bomb having yield of 4 mt.So any nukes launch at China would not bring China to it's knees but any nuke launched at India would do so.And due to India's high population density the catastrophe would be of biblical level. In such scenario we can expect International help but there too we have a problem.Our best friend Russia is BBF with China, so it would be very risky for the Russians to come to India's rescue as it is literally dependent of China for it's day to day economic activity and so is the case with much of the rest of the world.International community might show some sympathy but expect no help beyond that just like it happened in 1962.