Naoki IWATSUKI is professor of international law at Rikkyo University (Japan) since 2012. He earned LL.M from the University of Tokyo in 1998 and DEA from the University of Paris 1, Pantheon-Sorbonne, in 2000. He was visiting fellow at the European University Institute (2010-2011), at the Lauterpacht Centre for International Law, the University of Cambridge (2011), and at the University of Rome La Sapienza (2011-2012). His principal field of research is the peaceful settlement of international disputes, especially focusing on the legal regulation of non-military coercive measures during the process of amicable settlement of disputes, or countermeasures. On this subject, he has published many journal articles and chapters, including “Legal Nature of Non-forcible Unilateral Measures by Third States in Case of Grave Violation of Human Rights: Critical Analysis on the Doctrine of ‘Third-party Countermeasures,’” in Yuji IWASAWA, Koichi MORIKAWA, Tadashi MORI, and Yumi NISHIMURA eds., Dynamics of International Law: In Memory of Professor Akira KOTERA, vol. 765 (2018), pp. 49-55 [in Japanese] and “Chapter 81 Procedural Conditions of Countermeasures,” in James Crawford, Alain Pellet, Simon Olleson and Kate Parlet eds., The Law of International Responsibility (2010), pp. 1149-1156 (in collaboration with Yuji IWASAWA).