FOs in China
Captain doors are open, but you can forget about the FOs. Yes the opportunity opened once for private airlines but it is nearly impossible to find a FO position with state-owned airlines.
I have heard that a CAAC regulation states that no foreign FOs will be hired in China since there is no need for them...yet. Plenty of Chinese FOs to do the job, it's the shortage of Captains that are most important to the companies. Plus foreign FOs are too much hassle for Chinese companies. There is no way in "guaranteeing" that the pilot will stay the length of his contract.
If the company trains the individual and gives him a type rating, then the individual disappears afterwards. This situation definitely does not look good for foreign low-time FOs. Hiring foreign FOs just isn't very attractive to the airline company.
So to answer your question....foreign FOs no and foreign Captains...a big yes.