Ultra Cool writes:
There was a White tribe in China called Yuezhi, I think.
Turks. Almost Proto-Turkics. I think their descendants today would be best described as the Uighur people, who are ~1/2 White and 1/2 East Asian. However, a number of Uighur people, especially the women, look quite Caucasian. So I suppose these would be the farthest east of the Caucasians.
I have an 80 page paper on Turkic languages that is in line to be published in a book whenever they get around to publishing it. I believe that I discuss the Yuehzi in there, and if I am not mistaken, they were precursors of the the Uighurs or even better yet the Tocharians. If you want a truly White tribe in East Asia, the Tocharians would be your best bet. They have Tocharian mummies that have blue and green eyes and blond hair. They were found in China!
The Yuezhi were around ~2,000 YBP I believe. Most of the references we have to groups like that are from the Chinese. The Chinese were very helpful in that they developed a writing system early.
As a comparison, the earliest written Turkic we can find is the Orkhon Inscriptions (also very near China) which are these hard-to-decipher runic-type characters inscribed on stone pillars. I believe they have deciphered these inscriptions. So our attested Turkic only goes back to ~400 AD. Mongolic is even worse with earliest transcriptions ~1400 with Middle Mongolian. Tungusic is catastrophic with nothing at all written down other than transcriptions of the languages from early Russian settlers.
The Yukaghir have some odd Orkhon like inscriptions, but they are not Altaic. They are said speak an isolated language, but I think Yukaghir is related to Uralic.
With the lack of early attestations, you can see why Altaic is so hard to reconstruct and prove.