Today’s Japanese upper class have some ancient Eurasian (Aryan) genes.
Their ancestors mixed with the Samurai class over the last ~1000 years. The Samurai are descended from the Ainu native people in Northern Japan. According to people in Northern Japan have have Northern Eurasian genes from ~25,000–15,000 years ago.
Some Jōmon subgroups, specifically the Hokkaido Jōmon, received minor geneflow from a Yana RHS-related group, a deeply European-related Upper-Paleolithic North Eurasian population.
Those would have been Aryans. The Japanese upper class today have some Aryan genes.
My Aryan gene's on my dads side came from Persia, bloodline of Cyrus the Great. Many Japanese share Cyrus's surname, in their last names- Kuro.
It is the same story everywhere.
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