This book analyzes motivation, investments, and influence of the Russian Federation and Russian companies in the European oil sector, specifically, the Southeastern Europe. The main idea of the book is to highlight economic and political logic of the Russian activities in the oil sector as well as to provide a brief analysis of the situation in the natural gas sector. The findings help to understand the general code of conduct of Russian energy companies and their potential ties to their homeland government. This project will appeal to academics, researchers, graduate students, field professionals, and everyone who is interested in Russian and European geopolitics.