This volume deals with legal issues concerning Russiäs annexation of Crimea and intervention in the Donbas, so-called ¿frozen conflicts¿ and ¿hybrid warfare,¿ the use of courts and tribunals to address armed aggression, and the implications of recent events for the security guarantees connected to nuclear non-proliferation. Continuing from the first volume, which contains Parts One and Two on Chechnya and the Baltic States, this book is comprised of Part Three¿Ukraine and other successor States: Territorial Integrity and its Challengers in the Post-Soviet Space; Part Four¿Intervention and International Law; Part Five¿Legal Proceedings and Unlawful Claims; and Part Six¿Non-Proliferation after Budapest.