Khazaria is near Ukraine
What happened was a large number of Slavic people in Khazaria converted to Judaism that is why the Ashkenazi Jews look white instead of middle eastern. Some of the converts would have had children with actual Hebrews but their Hebrew percent is very low.
The Palestinians are the "true Hebrew Israelites" not the Ashekenazi Khazars. The Palestinians have the highest percent of Hebrew ancestry.
Palestinians converted to Christianity and Islam