You forgot that Russia has always had one of most extensive Jewish minority populations, and have routinely defended Russia since 1827 (when Jewish conscription programs into the army were enacted).
By 1921, Russia had
~6 million Jews, and while that number has dropped significantly to
132 thousand, that's still the seventh highest population of Jews in the world. Interestingly, the Jews have
their own mini country in Russia, though very few Jews actually elect to live there.
Calling Russia an ethnostate is absurd.