Find the name of the movie

Hi guys, I’ve been trying to find the name of a movie for decades… The main character is a dancer and he plays some kind of Russian roulette at some point (he’s a bit nuts). The toughest scene happens in a hotel room where 2 gangs of bad guys exchange drugs for money and this guy comes in the room in an armor and a steel helmet, kills everyone with a machine gun and takes the all money. There was also an undercover police man in the hotel room.
Thanks a bunch! I know you guys are the best in the world!

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