You don't get banned for activating a Euro/Russian key. If you have such a key, it will either let you activate it and you'll be fine, or it'll simply tell you you can't activate it. You get banned for using a VPN to fool Steam servers into thinking you're actually connecting from Russia in order to activate a key which Steam would normally not let you activate.
-What is best in life? -To crush your enemies, see them driven before you, and to hear the lamentation of the women.