Comment by t0mas88

One trick they use is to book via a different country. Flight from A to B when booked on the main English website in dollars can be a higher price than the same leg being booked on the Russian website in rubles.

Two reasons for that, one can be because the airline is less known in that market and whats to price more aggressively, and the other is that the ticket conditions are slightly different. For example your right to get compensation in case of a delay (and how much) may be different between those tickets.