China has to go on a land grab soon. They have huge numbers of young men, with no chance of a bride.
That often leads to unrest.
They should grab Siberia
I don't understand where this bee in the bonnet about single men comes from. In truth, throughout most of human history (including today), men of limited resources have remained single, whereas the wealthy have had access to multiple women in licit as well as illicit relationships. In China, polygamy was the rule until the mid-20th century, and poor men pretty much rented or went without. Japan is a real pressure cooker environment, and the suicide rates reflect it. Japan has a huge problem with single men (and women) and it's not as if a latter-day Tojo is gearing up for another Pearl Harbor.