The Corruptor (1999)

Nick Chen (Yun-Fat Chow) is one of New York's warrior cops. He was born into an immigrant family from China. Chen's job is to protect the Chinese territory from the fight between the Triads and the relentlessly dangerous Fukienese Dragons. They also had to put an end to drug trafficking.
Chen's Assistant on this issue is Danny Wallace (Mark Wahlberg). But Danny has no idea how bad the situation is.