Sometimes such messages appear in your inbox out of nowhere, even if you do not have a profile on any dating site.
The clients of dating agency sites get messages like this regularly.
If you've never met Russian women personally and know only general facts about them, then your idea about these ladies must be pretty vague.
Some men think that they are cold and severe just like the weather in the northern regions of Russia.
Correspondingly, a scammer is that very bearded Boris who starts a quick Internet-affair and then asks for money.