A fight is one of the quickest ways to tell if someone isn’t who they say they are. If you say you’re Russian, but fight like an American, you can consider your cover blown. Which means you’d better know Sambo, the mixed martial art of Russia. Of course, then you also have to win the fight. A great cover I.D. Doesn’t help much if you’re dead.
Michael Westen, Burn Notice 204 “Comrades”