Брат Brat (1997)
Very famous Russian movie, in Russia. This first movie was more like an introduction of the characters. The story is appealing, never the less, the movie is shorter but you don't notice, is one of the characteristics of the Brat's, they seem to never end with so much constant information.
Брат 2 Brat 2 (2000)
This one is my favorite, I believe it was greatly inspired in Stroszek by Werner Herzog, my favorite movie of all time. This time he goes to America to show the real American dream, like a comedian once said: You have to be asleep to believe it.
Overall, is the best hitman kind of movie I've ever saw. A interesting note, this movie was the base for the, by some called, best game ever made, GTA IV.