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There were Caucasian populations in eastern Asia into historical times, e.g., the Tarim Basin mummies, who had European features and wore clothing similar to what was worn in neolithic Europe. The Tocharian languages, of the same Indo-European language family as English and Latin, were spoken in parts of western China until around 900 AD. There are still some instances of light eyed and brown or blond haired people, not of Russian origin, in western China, Mongolia, and the Central Asian republics formerly parts of the Soviet Union.

If there were European-like people in eastern Asia in prehistoric times and a land bridge between Siberia and Alaska, as many suppose, they could have used this land bridge to migrate into the Americas as did those of Mongolian background. This may be more plausible than the suggestion that western Europeans, possibly like the Basques, migrated across the Atlantic via small boats.