Balkan Wars 1912-1913 are a nodal moment in the history of the peninsula in the XX century. and in the history of the Slavic idea. The book examines the place that Bulgaria and Serbia occupied in the life of Russian society during the Balkan Wars of 1912-1913, shows the actions of these countries to form the moods they need to achieve the greatest territorial acquisitions. Based on the publications of that time, the current image of Bulgaria and Serbia is reconstructed, an attempt is made to restore the real picture of the life of these states on the eve of the First World War and its features, to understand the peculiarity of Westernization "in Balkan." For specialists in the history of the Balkans, Russian public life at the beginning of the 20th century, as well as a wide range of readers interested in the past of Russia, Balkan peoples and Slavic idea.