Decisions of international courts and arbitrators, as well as judgments of national courts, are fundamental elements of modern public international law. The International Law Reports is the only publication in the world wholly devoted to the regular and systematic reporting in English of such decisions. It is therefore an absolutely essential work of reference. Volume 191 is devoted to the 2020 Award concerning Preliminary Objections of Russian Federation in the Dispute Concerning Coastal State Rights in the Black Sea, Sea of Azov, and Kerch Strait, the 2020 judgment of the Canadian Supreme Court in Nevsun Resources Ltd v. Araya and Others and the 2020 judgment of the English Court of Appeal in Mahmoud v. Breish.