Samurai Cop (1991)

Samurai Cop is a 1991 American direct-to-video action film written, coproduced and directed by Amir Shervan and starring Robert Z'Dar, Matt Hannon and Mark Frazer. It has attained a cult following.
When a renegade Japanese gang known as the Katana take control of the cocaine trade in Los Angeles, the LAPD transfer in a "samurai" policeman from the SDPD to help tackle the problem. Joe Marshall has been trained by the masters in Japan and “speaks fluent Japanese”, but dresses like a commoner.