For a long time, international institutions have formed the foundations of rule-based cooperation between states. However, they now find themselves under increasing scrutiny and have become the arena of geopolitical conflicts. At the same time, we are witnessing the development of new formations and the growing influence of non-state actors on the world stage. This book investigates the following questions: what are the new partnerships and cooperations arising from today's challenges? Where do actors derive their legitimacy? How can we revitalize the rule-based cooperation of states and reform institutions? A growing awareness of our global, collective interdependence and how this relates to structures of power forms an important backdrop to this investigation.