With Russian women you might get to see a little bit less of the stereotypical cold mechanical side of them if you can show you put some effort into learning the language. I hate communicating awkardly with hand signals like a couple of dopes so it's good knowledge to have. Last summer, the Hungarian crew in Floral Park had a really cute, crazy blonde chick called Lilly that didn't speak of word of English, so me knowing how to say a couple of words in Hungarian helped with her. So knowing at least a basic level of the language of nationality you know you like to monger with is a great tool to have.
b-ok.org got taken down, but search on pdfdrive .com and you can download textbooks/phrasebooks for what language you're interested in.