I tend to believe the vast majority of the asian world worked that way throughout history, having Caucasian or East Asian rulers. They would either dominate or push out uncivilized tribes to harsher border lands. But over time the browns eventually gain enough numbers to overwhelm the ruling minority in every country. Arabs tried to reverse the decline through White slavery. Jews did it via mixing with Europeans during the diaspora.

We kind of see the tail-ends of the phenomenon in real time with Egypt and Syria which still have affluent ruling classes who are whiter than a lot of the common people.