The study of international relations aims to provide insight into power dynamics, competition, and establishing peace and partnerships in the global system following the First World War. The international system is influenced by its various actors' behavior, which constantly evolves due to structural shifts. Although the bipolar hegemonic system of the Cold War ended in the 1990s following the two world wars, the system changes again with new threats and the search for security. In this respect, the 1990s were a period of the Cold War shaped by new threat perceptions and conflict areas. The security issue encompasses a vast range, from individual safety to the international system. While a country's expansion in foreign policy may trigger a defensive response from other actors International Relations Dynamics in the 21st Century: Security, Conflicts, and Wars, it is essential to acknowledge that the international system will face security, war, and peace to some extent. International Relations Dynamics in the 21st Century: Security, Conflicts, and Wars delves beyond fundamental crises and wars, examining their origins, ramifications, and management strategies. Furthermore, it focuses on today's modern and emerging threats, analyzing the international community's efforts to combat these dangers and forecasting potential scenarios. Covering topics such as foreign policy, international conflict, and terrorism, this book is an excellent resource for academicians, researchers, graduate and postgraduate students, policymakers, professionals in government and diplomacy, and more.