I doubt Myanmar will get involved in Chinese attack on India. They deal with China precisely because Chinese do not ask them to do anything uncomfortable.
People should not forget that mere 22 km broad land corridor of chicken neck will be more than 200 km for enemy to disconnect from India simply because of it's terrain and not to mention well equipped huge Indian military defending it.... Learn to think that way.... Keep your India hate aside for sometime....
By the way, if China wants to attack India in an all-round way, we will choose Pakistan instead of chicken neck. Nor will we aim at occupying Indian territory. If you refer to 1950, 1962, 1979. You will find that China's war theory is to destroy the opponent's war capability and then retreat. We never conduct a counterguerrilla warfare in the occupied area.
New Delhi is only 300 kilometers away from China. China also has the ability to directly cover the Indian capital with rocket clusters.
India is not a homogeneous country, and each state has a certain degree of independence and armed forces. Moreover, there are a large number of separatist organizations, religious armed forces and party armed forces.
So why should China have an all-out war against India? We can let Indians kill Indians.
We just need to take advantage of the fact that New Delhi is only 300 kilometers away from the border and concentrate our firepower to destroy the central government of India. Then throw incendiary bombs to burn farmland, and throw lead mercury bombs to pollute water sources and rivers.
Just withdraw the troops at next.
In order to survive and not be starved to death, the remaining Indians will be incited by ambitious people to launch a civil war to compete for resources. As long as we continue to kill the leaders of the strongest forces, and continue to burn food and pollute water sources. Maintain the balance of various forces and the continuation of the civil war.
A hundred years later, you will usher in complete destruction.
In our 5000 year history, we have repeated this tactic countless times. Why are all countries in East Asia homogeneous? Because all non homogenous countries have been killed by this tactic