The main difference between Russia and a rich country like for instance
canada is, that the average salary in Russia is lower. This mean, that less people in Russia have money for recreational
gambling. And it also mean, that trying to make money from
online poker and specifically online microstakes poker is more attractive to people in Russia than to people in Canada.
For this reason a country like Russia tend to supply many regulars to online microstakes games, while a country like Canada mainly supply recreational players. I would also say, that players from Russia tend to be fairly aggressive on average. But to be honest most regulars are aggressive these days, so its more an indication of skill level than some particular national character.