This book has explored the transformation of global power and diplomacy in the technopolar age, advancing the argument that digital autonomy and cognitive diplomacy are the twin engines of strategic sovereignty in the twenty-first century. As power increasingly resides in data infrastructures, algorithmic systems, and cognitive influence networks, states must transcend analog paradigms to assert agency and resilience in the digital realm. The rise of artificial intelligence has reshaped both the instruments and arenas of diplomacy, necessitating hybrid intelligence models that integrate human judgment with machine capabilities. Cognitive diplomacy is introduced as a new paradigm of statecraft, attuned to the perceptual, informational, and psychological dimensions of international engagement. The book presents a triadic operational framework—presence, practice, and resilience—as the foundation for strategic adaptation. It offers actionable policy recommendations to guide states in building sovereign digital infrastructures, cultivating AI literacy, embedding hybrid governance, strengthening cognitive resilience, and forging inclusive global norms. Looking toward the horizon, the book gestures toward “neurodiplomacy” as a frontier where cognitive science and diplomacy intersect. Ultimately, this work is a call for principled leadership, ethical innovation, and strategic foresight to ensure that democratic values and sovereign agency are preserved amid the profound disruptions of the AI age.