Don't you think it's a little easy to get shots like this when their back is turned to you? It just doesn't seem too inconspicuous but that's just IMO....

The photo wouldn't have as much impact if I had asked them to turn around and look at me, not that I could as I don't speak Russian

Sorry author, I do tend to agree with Josh. Even though it might not have had the desired impact, it is not like it is a difficult shot that you have to do it form the hip. In a crowd like that, you could have been shooting anything.

..BUT.. you get points for getting russian chicks in your shot.