It was obvious from the day one that China stood behind the legitimate Syrian government, including at the highest international body, UNSC, by stopping US-sponsored anti-Syria resolutions. I am not sure who were fuming at China, but I think China ignores the terrorist lovers and sponsors like Turkey or KSA.
In fact, China is in the process of reducing Saudi share in its crude import while Russia and LA region takes the prominent place.
I think Turkish operations are a smoke-screen to 1. stop YPG advancement to Jarabus, the only remaining gateway that enables Turkey to send help to moderate foreign terrorists. 2. to enable moderate foreign terrorist a safe enclave from which to launch attacks against Syria.