China is contiguous to India. The United States is on the other side of the planet with respect to Vietnam.
To subjugate India, China will conquer and annex the entire Indian northeast. If you don't stop antagonizing China, China will annex even more territory. This is called the Israeli approach on a large scale. Eventually, if you don't follow Chinese dictates then Indian territory will be the size of Pakistan.
The first step down this road is U.S. military bases on Indian soil. Once the Chinese hardliners have the support of the moderates in power, China will walk down the Israeli road. Israel is swallowing up the West Bank. China will swallow up as much of India as the Chinese moderates will agree to.