A nation of a million people cannot rule hundreds of millions by warfare; the Mongol Empire lasted because it offered its subjects things they actually wanted.

If you have a nation of 1 million people and you are ruling over hundreds of millions of people, hundreds of millions of people, China, Russia, the Middle East, you do not do that through warfare. You conquer them initially through warfare, but you do not rule them through warfare. You've got to be offering something that they want, something that they like.