> I had never seen a war movie produced outside of Hollywood. Or a director with primarily french influences producing a war movie.
Not sure if the stipulation is a war movie about Vietnam, or just plain a war movie. But certainly here's a list of some non-U.S. 20th century war movies, very vivid, biased towards France:
The Battle of Algiers (French, Gillo Pontecorvo, 1966)
Come and See (Russian, Elem Klimov, 1985)
Ivan's Childhood (Russian, Andrei Tarkovsky, 1962)
Beau Travail (French, Claire Denis, 1999) -- OK, soldiers but not war
Army of Shadows (French, Jean-Pierre Melville, 1969)
A Man Escaped (French, Robert Bresson, 1956) -- POW, not front lines
Little Dieter Needs To Fly (British/French/German?, Werner Herzog, 1997) -- actually relates to the war in Vietnam