I’m not sure of the PRC’s current birth policies, but I recall that before they started being “rich,” they had a strict one-child-per-family policy, which, combined with their cultural preference for boys, and the widespread practice of terminating baby girls, resulted in a youth segment of the population that was at least 3/4 male. Now, what is a large manufacturing nation, full of horny, unsatisfied young dudes, who understand that 2/3 of them will never be able to marry a home-girl, best suited to do?
I’m guessing that some day, they almost won’t be able to avoid finding a pretext for war. And I expect that they’ll want their efforts in that regard, to yield land. There’s empty land to their west … or to their east. Their choice is likely to depend on how they estimate their chances of prevailing, without suffering too badly. Your guess is as good as mine.