This book offers a multidisciplinary perspective on the Ukrainian people’s collective resistance to Russia’s full-scale invasion. The chapters examine how diverse sectors of society and ordinary people contribute to national defense and societal resilience within and beyond the military ecosystem, organized around five themes: meaning-making systems that sustain morale and national identity; mobilization of civilian and civic actors; democratic resilience through good governance and alternative institutions; tactical behavior, operational dynamics, and strategic planning for unarmed civilian-based defense (UCBD); and historical lessons from World War II resistance that inform today’s security landscape. The volume combines case studies, personal testimonies, historical analysis, and policy-oriented research. Its central finding is that Ukraine’s resilience stems from social trust, civic engagement, institutional accountability, and moral determination conditioned by decades of nonviolent revolution. The collection’s key contribution lies in framing UCBD not as a panacea but as a measurable, trainable capability—and a critical blind spot in 21st-century security planning—with direct implications for NATO members and democratic societies confronting hybrid warfare and authoritarian aggression. The contributors are Yuliya Bidenko, Felip Daza Sierra, Xavier Dorison, Amber French-Griette, Oksana Huss, Olha Kapets, Oleksandra Keudel, Mariia Korobkova, Olga Kravets, Emma Mateo, Oleksandra Matviichuk, Andrii Ordynovych, Taras Prokop, Jamila Raqib, Alain Refalo, Olga Sagaidak, Yan St-Pierre, Nataliia Sukach, Yelyzaveta Tarasenko, Olena Tregub, and Kai van Rosendaal.