From my experience meeting EE women in Europe, specifically German FKK clubs, the best experiences are with Polish women, then come the Hungarians.
Russian women I've met have been either really good or really bad. The same goes for the Ukraine, Belarus, etc..
The rule is this: the closer her country is to the former Iron Curtain, the more likely you have something in common with her, the better her service. So this includes Poles, Hungarians, Czechs, etc..
The further away she comes from, the less you are going to have in common with her and the lousier her service.
This explains why Bulgarians and Romanians who make up a lot of the SW population in the clubs in Germany are so lousy service-wise. The Romanians have such a bad reputation they spend most of the time there trying to convince you they are either Spanish or Italian.
Good luck trying to get along with a peasant woman from Kazakhstan who would otherwise be milking goats.
I am, by the way, listening to Polish language tapes at home. I know a few phrases and totally butcher the language when I try it but it always gets Polish women laughing as they find it amusing.
Its all about chemistry and making connections.