This book explores the challenges small states face in navigating the complexities of modern war, particularly within the ambiguous Grey Zones where the boundaries between peace and conflict blur. This book addresses the multifaceted challenges of policy, strategy, operations, and tactics, providing valuable insights into how small states can deter and manage violence. It highlights the vital role of international organizations, alliance‐building, cyber operations, information warfare, lawfare, and the balance of power. Additionally, it tackles the issue of strengthening state security and fostering social cohesion in the face of Grey Zone threats. A distinctive feature of this book is the inclusion of innovative design problems developed to assist small states in navigating complex security landscapes with both practical and strategic approaches. This book will be essential reading for security practitioners and military professionals and of great interest to students of security studies, defense studies, and international relations.