For example, I think every (or almost) Chechen mma fighters from Poland were born in Russia (RSFSR) and people doesn't refer to them as Russian mma fighters. While, I remember I've seen comment about a few of them that they doesn't fight outside of Poland because they are not Polish citizens and to receive Polish citizenship they are not gonna leave the territory of Poland for some time. Also look at someone like Sarnavsky - from Kazakhstan but gets called Russian almost everytime.He wasn't born in Russia? If that's the case i don't see how you can say he's not Russian
And from what I understand seems like people see it differently in Russia and in your country - like, I think few Russian mma fighters considers Karakhanyan American, while he (ethnically Armenian) was born and raised in Moscow and I think I've seen he was saying that he considers himself more Russian tham Armenian or something along these lines.