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.
Sometimes Koreans are born with blonde hair. I know some Koreans have blonde hair. I know Korean is related to Turkish, Japanese, Hungarian, Finnish, and Estonian, hence Altaic-Uralic. I have heard Turkish spoken before, it does sound Korean. Many Koreans pick up Hungarian quickly because of grammar and wording. Finns have one of the highest rate of blondes in the world. I notice actresses Mena Suvari (Estonian), Tara Reid (part Hungarian), and Pamela Anderson Lee (Finnish) look kinda Asiatic to me.