Odd film (SPOILERS)
It takes a while to adjust your ears to an international cast (English, Australian, Guatemelan, Danish) all speaking English with terrible (and inconsistent) Russian accents. Meanwhile, the film takes place entirely in Russia accompanied by signs in the Russian language. This formula really strains credulity.
Another problem is the sudden shift between effective, irreverent comedy and brutal violence. There are sympathetic characters in this film and we identify with them, yet they're suddenly dispatched in scenes that don't make much sense (why weren't they killed much earlier: why are they so SUDDENLY and SAVAGELY bumped off?) The contrast between very funny send-ups of the criminal mind to nasty violence is very jarring indeed.
This is an interesting film that wants to underscore our apathy about the horrors of plutonium (we seem to have grown indifferent to its monstrous capacity to destroy the world). Unfortunately, the film doesn't have a constant focus, and comes off ultimately as confused and muddled. And that ending is straight out of a feel-good Disney flick.