Also war-related and set in Japanes concentration camps is Paradise Road (1997), based on a true story and with a good international cast that did some real life starving to play their roles of emaciated prisoners with conviction.
And another Finnish war film (but the last one I am pushing here I promise
) is Tuntematon Sotilas (The Unknown Soldier, 1985), based on a gripping novel from a veteran of the Continuation War between Finland and the Soviet Union (1941-1944). There are two versions of this film (the older one is from 1955), but the latest is darker and focuses more on the action, of which there is plenty; this film too is well over three hours in length (well, you try and fit a whole war in 90 minutes!). Worth seeing.