This book presents a comprehensive overview of political and economic developments as well as security issues in the Korean Peninsula during 2008-2020 from a Russian perspective. The authors offer a rich analysis of domestic affairs in both Korean states and the international situation they act in. The book's first section,  Diverging Development Paths , analyzes the evolution of North and South Korea in the early twenty-first century. The next section,  The Nuclear Challenge , assesses Seoul's and Pyongyang's foreign policy options within ever-changing domestic and international circumstances - under the looming nuclear shadow. The final section,  Partnering with Russia , presents an unprecedented first-hand account of Seoul's and Pyongyang's dealings with Moscow. The book provides a unique account with expertise from Russia, one of the four states directly involved in Korean affairs, providing insights on domestic and diplomatic decision-making of the two Korean states and international efforts to resolve the nuclear issue.