> This is what many believe (e.g., Peter Zeihan) to be the real reason behind the invasion of Ukraine.

This does not make any sense. Banning birth-control would be the most cost-effective way to increase the birth-rate, stronger social programs being a strong second.

Much of what I've heard from Zeihan sound memey – like camp-fire stories or what your older brothers friends would tell you – without anything meaningful to back it up.