I don't agree in the case of Japanese,no historians could identify the actual ethnic tribes ( i.e. Anglo-Saxon-Jute settled in parts of present day UK & the Norse in later centuries ) known as Yamato & etc and very few modern Koreans & Chinese share ancestral roots to those left the Asia continent for Japan islands pre-13th century.
Exact scenario for the Japanese,we all thought their ancestors were the Koreans & Chinese but in fact have signifant ancient proto-Mongoloid indigenous genetic component.
They usually word it " half & half "
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