Vozvrashcheniye aka The Return (2003) NORDIC PAL DVD9

After twelve years, Russian pilot Otets returns to his wife and their two sons, Vanya and Andrey, who are torn between the hope finally to have a proper father and resentment for being abandoned with their mother. After a short stay, he takes them -no choice- on a 'weekend camping trip'. It's suspiciously far and desolate, while he keeps testing their courage and finds the junior hostile, without rewarding the firstborn's attempts to please. The pleasant fishing is aborted to take them to an utterly desolate island by rowing boat, where he stashed a secret box, but a grim fate awaits them.