This book investigates how the geopolitical shift following the September 11 attacks fundamentally altered the doctrine, perception, and execution of international peace operations. Thierry Tardy, a recognized expert in security studies and international organizations, examines the intersection of counter-terrorism strategies and traditional peacekeeping mandates. He analyzes how the 'fight against terrorism' has forced a recalibration of the roles played by the United Nations, NATO, and the European Union in conflict zones. The text argues that the post-9/11 security environment has introduced new complexities that challenge the neutrality and effectiveness of multilateral intervention efforts.

Experts and scholars in international relations frequently cite this work as a critical examination of the evolution of security doctrines in the early 21st century. Readers often note the academic rigor and the clear, analytical framework used to dissect the complex relationship between global counter-terrorism efforts and traditional peacekeeping missions.