I'm pretty sure that both his maternal grandpa and grandma immigrated to Brazil from Russian Empire.So what? Brazil is a state of immigrants, nearly all of them have roots from somewhere in Europe or Asia, just because his grandmother was Russian (why am I not suprised that his russian roots are female, LOL) doesnt mean he is anyhow emotionaly connected to Russia.
I live in Argentina, one of my assistants has italian ancestors, the other spanish ones, my landlord is a wolga-german, my neighbors grandparents are from Brazil, one of my friends has a russian mother and my best homie is from Bosnia, so, still all of them are Argentinians (except the Bosnian - Mashalla).
And kinda agree, it's weird sometimes, when people here surprised that there is mma fighters of Turkish, Greek, Yazidi, African, Korean, Arabic origin from ex-Soviet countries.