Summary/Abstract: The paper is dedicated to complicated issues of comprehension of one of the turning events not only in XX century, but all new and the newest period of history – the First World War, problems of its origin and preconditions. The reasons for the First World War in many respects become more obvious just from the position of present processes’ assessment in modern world. One of them is continued deep instability in the Balkans, arisen from a number of unsettled ethno-confessional and interreligious problems, as well as on the score of the repeated arbitrary delimitation of state-territorial borders in the region, aggravated by historically mutual suspiciousness of nations, etc. Among daunting problems, needed to be solved for more than 100 years, exist such as – the division of Serbian ethnos, the unsettledness of the Kosovo question, the Albanian separatism and nationalism, closely connected with Islamic vector in Europe, etc.
