At least Russia’s criminal population isn’t dominated by ethnic minorities.

I wonder if that's entirely true. I strongly suspect they're overrepresented. Historically the Soviets deported a lot of non-Russian minorities to penal colonies. Same thing now, where a lot of Ukrainians are being deported to the far east.

Russians are also quite frequently virulently racist. People from the Caucusus, central-Asia, etc. Anti-semitism too.

Of course, now they're disproportionately sending those minorities to die in Ukraine, so there's that.