Over here.
That stock split in two ~ with the Europeans going one way, and the East Asians going the other. The East Asian group branched into two groups, Ainu and Chinese.
Every now and then you'll find a Chinese who has many of the same "Caucasion" features carried by the Ainu. For example, Chou En-Lai could "pass".
You also find traits of blondism among the Koreans. This readily explains the origins of their Uralic-Altaic language.