Opening Address -- Revisiting Solidarity as a (Re-)Emerging Constitutional Principle: Some Further Reflections -- Solidarity and the Law of Development Cooperation -- Responsibility to Protect: Reflecting Solidarity? -- Intergenerational Equity -- Military Intervention without Security Council’s Authorisation as a Consequence of the “Responsibility to Protect” -- Common Security: The Litmus Test of International Solidarity -- Concluding Remarks.

This volume presents a high-level scholarly discussion on whether the concept of solidarity functions as a structural principle of international law and to what extent it has become a full-fledged legal principle. Each contributor addresses these questions by examining normative operations of the principle of solidarity in different branches of international law – including international disaster law, international humanitarian law, the law of development cooperation and international environmental law – as well as the relationship between the principle of solidarity and other legal principles such as the responsibility to protect and intergenerational equity.