This was after 13 years of friendship between India and China, where India had supported China in many ways including supporting the Communists getting the UN Security Council seat reserved for China. China and India had signed a friendship pact just a few years before.
> Perhaps there are not many instances in history where one country has gone out of her way to be friendly and cooperative with the government and people of another country and to plead their cause in the councils of the world, and then that country returns evil for good
That’s how India’s PM described this barbarous act of betrayal.
This was a good demonstration of how China views its neighbours. As vassals to be brought to heel from time to time, rather than equals. And China will use violence to achieve these aims. That’s the Mao doctrine, followed by every Chinese leader since.
And before you try any nonsense of “oh that’s old news”, China is annexing Bhutan today to put pressure on India to make territorial concessions. (https://youtu.be/io8iaj0WYNI). China is annexing international waters in the South China Sea. China is attempting to annex islands controlled by Japan. China also has border disputes with Russia.
Educate yourself instead of uncritically spreading Chinese propaganda.