Editor’s note: Mary Ellen O’Connell is the Robert and Marion Short professor of law and professor of international peace studies-Kroc Institute at the University of Notre Dame. She is the co-author of “Self-Defense Against Non-State Actors” , among many other publications. The views expressed in this commentary are the author’s own. View more opinion at CNN.
Military necessity restricts targeting to legitimate military objectives, the destruction of which will provide a definite military advantage. Even then, targeting is unlawful if it causes a disproportionate loss of civilian lives.