International Law is the definitive and authoritative text on the subject. It has long been established as a leading authority in the field, offering an unbeatable combination of clarity of expression and academic rigour, ensuring understanding and analysis in an engaging and authoritative style. Explaining the leading rules, practice and caselaw, this treatise retains and develops the detailed referencing which encourages and assists the reader in further study. This new edition has been fully updated to reflect recent developments. In particular, it has expanded the treatment of space law and of international economic law, and introduced new sections on cyber operations and cyber warfare, as well as reflecting the Covid-19 crisis. Both clarifying fundamental principles and facilitating additional research, International Law is invaluable for students and for those occupied in private practice, governmental service and international organisations.