The Karate Kid : Part 3 (1989)

Cobra Kai karate instructor John Kreese (Martin Kove) is still brooding over the defeat handed to him by Daniel LaRusso (Ralph Macchio) and Mr. Miyagi (Noriyuki 'Pat' Morita). He then attempts to gain revenge on them, with the help of a Vietnam War comrade, the wealthy owner of a toxic waste disposal business.