Russian? As in ethnically Russian / Belorussian / Ukranian? Or something else? The majority of the former USSR's population is Asian. That is, mostly Central Asian, Middle Easterner, Armenian, Jewish, etc., that speaks the Russian language but isn't Russian. Calling someone "Russian" is like calling someone "American." It obscures more than it reveals.
Pretty much any woman from the former USSR is quick to refer to herself as "European," and to call Eastern European food, dress, and culture "European" (as opposed to Central Asian). It's a fairly reliable indicator that she's not Russian if she doesn't use every opportunity to press the point that she is and associates herself with "European" (but rather, keeps referring to herself and her culture as "Russian").
Why is this important, you ask?
Because if she was raised in an area with any appreciable population of Muslims or Jews, she likely has several male family members pretty much permanently attached to her. They might live separately for some years, but like a bad penny, the male relatives will turn up in her life again and again. They'll act like romantic rivals instead of potential brothers.
If she's not ethnically Russian, but instead, from Near-Eastern background, there's no way of knowing if her ex-boyfriend is or is not one of the clinging male relatives. You can't tell by the last name. Even if the ex-bf is not, the cousins / uncles / half-brothers will be calling and texting her cell phone, showing up in her emails and Facebook, driving her car, dropping by and asking to be cooked dinner, or walking right into her bathroom while she's showering. (Her "culture" tricked women long ago that such obtrusive behavior is OK because they lived 10 to a house and "grew up together" or "is borderline retarded and does the best he can" or whatever BS the guy says to get away with anything he likes.) What's more, she'll have the reputation for being a sl0t within "the Russian community" (aka Russian-speaking immigrants from Uzbekistan or Georgia or wherever she's from, along with any ex-pat Russians who hang out with fellow speakers). It's this reputation that gets her laid 9 out of 10 times. She'll love the attention and it's impossible for her to distance herself from it for any length of time.
If she's an Near Easterner, she's a pump 'n dump. Don't ever look back. You don't want to deal with passive-aggressive sexual shenanigans for one day much less over the course of a relationship.
If she's an ethnic Russian, she's only marginally relationship material. After all, it is a Third World sh1thole and their manners are pretty vulgar. Your move.