The problem is, a really beautiful Russian woman will rapidly realize once she gets here how much more social value she has in the US than she ever had in Russia - since America puts beautiful women on a pedestal and empowers them like no other nation on Earth. There is no way the relationship will last unless the two aren't all that far apart in looks and background - an albino walrus isn't going to marry a "10" and keep her, no matter what, any more than he could attract and keep an American "10". A fairly good looking, successful American man, on the other hand, could manage to land and keep a stunning Russian wife...but such men usually don't have as much motivation to look overseas.
One of my employees recently met a Filipina woman online and married her. He had been divorced twice, and having met and enjoyed the company of several Filipina women in the office, he decided he might like to test the waters over there. He is certainly no "10", but he is a honest man with a good sense of humor. And his new wife is no "10", either, but she seems to have a good heart and to genuinely love him. So far they are very happy. Had he gone over there and come back with a Filipina "10", he wouldn't be able to keep her - but his expectations were realistic and the results have been very good for him so far.
I've seen American women who just go ga-ga over a guy with a foreign accent. I suppose there is something intriguing to many about someone from another culture or a different background. I think that could be some of the attraction for finding mates overseas.
I also agree that American women have often become too demanding and too difficult to impress. It used to be a woman was happy to have a man who was faithful and a good father. Now, he's got to be pulling down 100K in addition or they think they have grounds for divorce.