Why make actors speak that accent?

Rating: 9/10 (19 June 2015)

Well, as it is clear from my feedback I am from Moscow, Russia. It's such a shame that the movie is not to be aired here. For it has a brilliant cast and an amazing storyline. When they were screening it, I was very much looking forward to it. I have no sympathy for those involved in banning movie here - it's beyond ridiculous. Still hope I catch it some day on DVD or so.
I've seen several trailers though, and the only thing that myself and some of my friends noticed and were quite upset about actually, is the fact that actors, presuming story happens in Russia, speak massive Russian accent(!). I don't know if it stroke as an odd thing anyone else out there, but for me it was quite off-putting, which is shame, because casting and story as I mentioned are great. I mean I would have understood the necessity for accent, if the story was happening somewhere abroad, and it would be natural for actors to speak in English with Russian accent. But why make it here? To add more value to the characters? But nobody speak their native language in their homeland with accent. Bit odd. Big question to the director? why?