Russian escorts in Bangkok — why this page exists here and nowhere else
Because Bangkok asks for it. Around 490 searches a month, which is more than this city's entire European category manages, and considerably more than Hong Kong or Tokyo ask for the same thing.
That is the whole justification. This site does not run a page per nationality — four of them were removed for earning twenty searches a month between them — and this one is here because the demand is real and specific rather than because a nationality page seemed like a good idea.
What "Russian" on a card is actually reporting
Her own listing, and nothing past it. No passport was seen — not by this site and not by any directory you will find. Origin is a claim a photograph can support or undercut, and that is the whole of the mechanism available to either of us.
It is worth weighing harder here than elsewhere. This is the one city where the label leads the origin searches, and a label that leads demand is the label with the most reason to be typed by people it does not describe. Where a listing states no origin, its card states none.
Russian or euro
Both grids exist and they overlap. If Russian specifically is what you want, this is the shorter route and the one this city actually types. If you want the European end broadly — French, German, Polish, British — the euro page is the wider net.
Neither is a better answer. They are different searches, and Bangkok makes both of them.