The Fourth War is a 1990 American cold war drama film directed by John Frankenheimer. It is set in West Germany of the late 1980s, and was filmed in Alberta, Canada. It stars Roy Scheider and Jürgen Prochnow as two military men whose personal dispute threatens to escalate into a larger conflict. Variety called it "a well-made Cold War thriller" and praised the casting, as well as well as Frankenheimer's direction praising for having "an eye for comic relief as well as tension maintenance".
(Summary from Wikipedia)