Foreign movie where a young man has sex with his mother, again with another boy and at the end of the movie kills her after killing her he leaves with his backpack on a dirt road

During the Bosnian War, Danijel, a soldier fighting for the Serbs, re-encounters Ajla, a Bosnian who's now a captive in his camp he oversees. Their once promising connection has become ambiguous as their motives have changed.