The Ashkenazi Jews are from Europe, about 32% of Israeli Jews. Two-thirds are every other "ethnic" group, Sephardic, and other diaspora Jews.
The very reason, though, that European Jews fled to Israel was because of the Holocaust. This problem started back during the 30's because of fascist scapegoating of Jews in Germany, Russia (yes, Russia initially had a pact with Nazi Germany).
The Europeans created this god damn mess. And some Europeans, mostly Germany, and the US are fucking shit up again by supporting the Israelis and their colonization and oppression of the Palestinians.
This is complicated, but the root of this problem starts in Europe.