Walking by a TV in the cafeteria to refill my coffee cup this morning, I see the crawl "Russia: Poland risks attack over US missile defense plan."

So while Georgia is sad and regrettable, it is periphery, but Poland is a NATO member and not periphery. An attack would call out article 5, and thus war (which I think the Russians would lose, if it remained purely conventional). Are the Russians bluffing and hoping for a little intimidation effect coming out of the Georgia debacle, or do they mean business?