This study book offers a thorough and up-to-date introduction to international law concerning the use of force. It addresses the main aspects of international legislation regarding the prohibition on threatening with or using force, and provides insight into the meaning of 'force' within this context. Among other topics, the book highlights the role of the United Nations and regional organizations, peace operations, the right to self-defense and its limitations, as well as the controversial law on humanitarian intervention and interventions in internal conflicts.
In addition, this edition has been expanded to include attention to modern developments such as cyber operations, the threat of force, and the human factor in the use of force. Recent cases, including Russia's invasion of Ukraine in 2022, illustrate the current legal framework and contemporary challenges within international law.