Jews are a race of mongrels just like the Japanese.
Ashkenazi Jew DNA = North African, Levant, Georgian, Turkic, Slavic, small traces of western European R1b, there's a few others that I can't remember off the top of my head
Japanese DNA = Yayoi (Koreanic -y-dna O2b1 + northern Han chinese y-dna haplgroup O3e, Jomonic (haplogroup D3), small traces of C3 (altaic speaking peoples related to the mongols), small traces of Uralic (y-dna haplogroup N), small traces of southeastern chinese austronesian (haplogroup O1). small traces of vietic, austro-tai (haplogroup O2a).