This book analyses the collective security system as it now stands, focusing on strategic and normative frameworks. The old system of international collective security is based on assumptions that are inadequate in relation to current challenges. Against the backdrop of changed geopolitical constellations, democracies under siege and the challenges posed by new types of warfare, critical analysts hold that not a single multilateral institution today is fully up to the task it was created for. The UN, from its founding to the Sustained Peace Approach, represents a fascinating global process...