The book of Extraordinary and Plenipotentiary Ambassador of Guatemala in Russia Herbert Estuardo Meneses Coronado is devoted to studying the causes of the world wars and regional conflicts. Based on a variety of materials the author explores the hotbed of tensions in the late 19th century, during the 20th century and nowadays, served as the beginning of many years of murderous wars. A common thread throughout the book is the idea of the necessity and possibility of the efforts of all mankind to put a barrier to military conflicts, new challenges and threats to the security in the 21st century using the UN’s central role in the world affairs on the basis of multilateralism and the rule of law