[JohnnyB]

China's whole path into modernization has been driven by urban migration. Go visit the countryside of China and you will see it's full of farming villages where you only find the elderly and little kids. The middle generation is all missing as they moved to the cities, and nobody is left to do the farming. China has been sufficiently worried about not having enough people doing farming in their own rural areas that they've been advancing policies to motivate people to move back to their own countryside. Hardly seems like a situation that threatens an excess of Chinese farmers populating all of Siberia in some weird twist on replacement theory.