Clancy had a great novel based on this premise: “The Dragon and the Bear”. Great read.
That being said demographics are such that if China wanted to do it they have to go now else it won’t be happening. Currently Russia’s birth rate is higher (1.5) than China’s (1.2)and predicted to remain so into the 2070s.
See here: https://data.worldbank.org/indicator/SP.DYN.TFRT.IN
See model here: https://www.youtube.com/watch?v=3_7WK-QPCQE
*The Bear and The Dragon*Tom Clancy*
1000 pages. Don’t tell me it’d THAT good.