Regarding China backing Pakistan, I think it can never stop. Just recently I have read that China has invested about $56 billion in Pakistan and Pakistan-occupied-Kashmir for developing infrastructure, whereas when Indian PM went to China for investments, he has been handed only $20 billion. Chinese and Indian army are already engaging one on one on the borders. Chinese intrusion in Indian borders have lot of evidence.
Pakistan has been prostituting to China for many decades now, and that is why China is showering them with so much investment. Ever heard about the Shaksgam Valley (Trans-Karakoram Tract)? It was a strategically important piece of land in the Kashmir region, which was under the control of Pakistan. The Pakis sold it to China for peanuts.