Which film concerns a tough chick and total junkie becoming a professional international assassin?

The 1990 film that concerns a tough chick and total junkie becoming a professional international assassin is "La Femme Nikita". The film, "La Femme Nikita" (French, "The Woman Nikita"), also called "Nikita", is an action thriller that was written and directed by Luc Besson. It was produced by Patrice Ledoux.

The film stars Anne Parillaud as the title character, Nikita. She is a ruthless street junkie whose killer instincts could make her the perfect weapon. In this French film that was remade as "Point of No Return" (1993) in the U.S., Nikita is recruited against her will into a secret government organization. She is broken down and transformed into a sexy, sophisticated "lethal weapon".

Film critics said: "This film delivers a fully developed, strong yet humanly fragile, fascinating female lead character, masterfully played by the incomparable Anne Parillaud. It provides the audience with an ultimately satisfying and entertaining motion picture experience. We love everything about this movie: the use of color, sound effects, music, and superior cinematography. All the performances are first-rate, including the one from actor Jean Reno, as 'The Cleaner'. A film such as this doesn't get any better."