Salween

Salween is a 1993 Thai action-drama film directed by Chatrichalerm Yukol and starring Sorapong Chatree and Chatchai Plengpanich. Sombat Metanee's son, Siricoup Metanee, also stars as a young police lieutenant, newly arrived at a rough-and-tumble post in a Thai-Myanmar border town on the Salween River. The screenplay is co-written by Chatrichalerm and Stirling Silliphant.

Synopsis from Wikipedia, CC BY-SA 4.0. Everything below written here.