Hmm, I guess I got lucky then. My account region is C.I.S. (Ukraine), but none of the games I own have been locked for me when I'm in Europe, although when browsing new games I've encountered a few that warned me they'd be locked to the home region, and a few others that would be locked to Russian language only.Steam locks games, not publishers.
Russian games are locked for Russia and CIS, which are in summary, USSR land area minus Baltic countries