In the east ethnicity is important too but for different reasons and in the west you might want to claim you know that you're related to Scandinavians if you're a white supremacist. In the east traditionally people like the Russians have wanted to downplay how much Scandinavian blood is in the ethnic mix. There's also multiple large tribes of people it's an ethno let's call it an ethno cultural identity of people we would call slobs today oftentimes this is linguistic.