Puh-leeze. There was no doubt as much cross-shtupping in Asia as in Europe. Do you have one scintilla of evidence to support your contentions?
What the hell are you talking about, evidence? When was the last time you saw a naturally blonde Korean? Or one with blue eyes, or curly hair?
It's a matter of having bred within a certain (very large - I'm not implying anything bad here) gene pool, until the dominant genes are so dominant that the recessive ones almost never show themselves.