[Mateusz Piątkowski is an Assistant Professor at the University of Łódź, Poland (Faculty of
Law and Administration, International
Law Department), Attorney-at-
law, and Member of the Polish Society of the Military
Law and the
Law of War. You can find Part I of this post here.] Under international
law, military confrontations between states are measured by their intensity and gravity. To establish the threshold and to distinguish between the less and more grave forms of use of force, ius ad bellum offers a three-tier classification of interstate incidents. Tier one is...