“It is the first and the only book to offer a comprehensive overview of the international law aspects of Russia’s involvement in Crimea in 2014. … offers a comprehensive and analytical overview of the relevant modern rules of international law in the field of territorial integrity, self-determination and the use of force. … This is certainly indispensable reading not only for international lawyers but also for a wider audience interested in modern international conflicts.” (Natalia Cwicinskaja, Israel Law Review, Vol. 50 (2), 2017)

“A fascinating and thought-provoking work, which provides a compelling and comprehensive analysis of the legality and legal implications of the Russian intervention in, and annexation of, Crimea. It is an impressive and eloquent study that touches upon various fundamental issues of international law and places the Russian actions in their broader normative context. It will remain an authoritative work on the Ukrainian crisis in the years to come, of considerable interest to international lawyers and international relations scholars alike.” (Tom Ruys, The American Journal of International Law, Vol. 110, 2016)

“The Russian invasion of Ukraine needs to be understood in its full dimension as a challenge to the state system of respect for borders. Grant provides that important service in his timely book.” (George P. Shultz, former Secretary of State of the United States)

“This is an extremely welcome guide, historically grounded and convincingly reasoned, to a turning point in international relations and international law.” (Timothy Snyder, Bird White Housum Professor of History, Yale University, USA)

“[Grant's book] presents a comprehensive argument and will doubtless be an essential reference for all persons treating the subject of Russia's aggression in Ukraine in the future. Lucid and convincing. . . .” (William H. Taft IV, former Legal Adviser of the Department of State of the United States)

“Grant deploys his substantial knowledge of international law, particularly its rules on territory, secession, and self-determination, to unpack and critique the various arguments for and against Russia's case. . . In doing so, Grant highlights the significance of these events to international law more generally, emphasizing the tensions it creates within a UN system that has served as the centerpiece for inter-state relations since 1945.” (Duncan Hollis, James E. Beasley Professor of Law, Temple University School of Law, USA)

“. . .a painstaking examination of the issues involved and a passionate statement of international law against the annexationist law of the jungle.” (Brendan Simms, Professor of the History of International Relations, University of Cambridge, UK)

“Russia's annexation of Crimea is one of the few international crises in which the public discussion revolved primarily around issues of international law. Thomas Grant has written a fascinating analysis of those legal issues. His discussion of Russia's legal justifications for its actions is both thorough and wholly accessible to those new to international law. Aggression Against Ukraine is essential reading for both understanding the Crimea crisis and the international legal system by which Russia's actions must be judged.” (Gregory H. Fox, Professor of International Law, Wayne State University, USA)