Response to "Naslednik" and Post # 430: Yes, the usage of the Russian "rolled r" is distinctive. I have several times travelled the total depth of "Western " or "European Russia," always in the company of friends who were/are native Russians, using private and public LAND (NOT the "impersonal" air) transportation. Family friends of mine in Yaroslavl Oblast, one of my very favorite areas, have a now-13 year old who "adopted" me as his "uncle" when he was in day-care. Nikita is amazing, in that being native born, he has apparently NEVER rolled his "r"s (unless he's just begun in the past couple of years). He speaks only Russian. There is no defect of the mouth cavity, etc., per se, to obstruct such. Fascinating to listen to him speak, somewhat akin to hearing the youngsters speak in Barcelona and Malaga, in Spain, where I have also done a goodly bit of traveling.
By the way, Yaroslaval is a favorite place of mine, being established in AD 1010. Terrifically historical and deeply interwoven into the fabric of Russian history, unlike the "just over the border "fringe" cities/town where tourists make a "token" visit and announce that they have seen the "real Russia." ( It's like my favorite joke re Colonial Williamsburg Restoration in Virginia, USA. The question goes: "Have you ever visited Colonial Williamsburg?" The answer: "Oh, yes! Saw it All, and enjoyed it immensely! I was there for more than one-half day!" Of course, they were then on their way to their REAL interest: "Busch Garderns," just down the road!) Regards, AP.