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Number of jews does not equal having a diaspora. There are more jews than armenians in saint petersburg, yet jews do not form a definite and organized diaspora while armenians do, and a very prominent one.
All major Russian oligarchs and most of TV/Cinema personalities are Jewish
Very, very far from truth. Oligarchs form a diverse mafia-like network of people of various nationalities, with nationality usually having little to do with their real source of power. Check it out yourself:
http://en.wikipedia.org/wiki/Category:Russian_billionaires
Yes, jews occupy a disproportionate percent of names in this list, but it's far from being 100%.
About hatred: perhaps you are reporting from the very lows of society (orthodox hags and gopniks), who may hate jews for real, but near the middle much much more hatred is directed towards barbarians from caucasus, asian worker drones, and infidel cops. These categories are very poorly integrated into the human society and are very visible, unlike russian jews.
The reason behind backwards rural russians hating muscovites and saint-peterburgians is because these two regions expropriate most of the surplus provided by the regions. Local media make sure they perpetuate whatever shortcomings they see in muscovites to intensify this hate (``divide and conquer''). There are as many myths about moscow in russian regions as there are myths about US in north corea.