1) Do you see the little icon in the buttom right of ur screen that says "EN"? ok right click
2) then choose "settings"...a browser will appear...so click "Add" on that browser
3) now in the next browser choose "Russian" in the "Keyboard layout/IME"
and that's it...now u can type in russian cyrillics...and no it does not affect anything else...except that some media players won't play files that are named in any language other than english...other than that i haven't encountered any problems...cheers
Tip: to quickly shift between languages...press Alt + Shift and see the little icon change from "EN" to "RU"...