Undeclared War is a 1990 Hong Kong action film directed by Ringo Lam and starring Danny Lee, Olivia Hussey, Peter Liapis, Rosamund Kwan and Vernon G. Wells.

Warsaw's liberation army is actually a terrorist organization under the banner of a revolution and in order to show their strength, they prepare to create a bombing incident when the US business delegates visit Hong Kong to achieve their political objectives.

The CIA finds clues and sends Agent Gary Redner (Peter Liapis) to Hong Kong to prevent this conspiracy.

The two cops from different environment were incompatible working together at first, but they gradually produced a profound friendship and they work together to shatter the terrorists' attempt to sabotage a media organization's party killing all the Warsaw's liberation Army members.

However, thing are not over yet, as Hannibal breaks into the television news department and takes all the staff hostage including Lee's girlfriend Ann (Rosamund Kwan) and prepares to create a bloodshed to be broadcast throughout the world.