It's not coincidence to have a sudden increase of Chinese military aged men flooding the border at the same time China has been rapidly expanding their military, developing the BRI, forming alliances with Russia/BRICS, preparing to replace the petrodollar... Oh, and Xi just had two days of meetings with Putin in which he concluded by saying:
“Now there are changes that haven’t happened in 100 years. When we are together, we drive these changes."