During the bipolar period, insurgencies were most often considered as a way of fighting for liberation from colonization, repression and other forms of political violence. However, its features as a foreign policy tool were also noticed, so at the unipolar geopolitical moment they gained greater importance. Due to such a variety of manifestations, many definitions of this complex form of political violence have emerged. The problems that researchers encounter in searching for the essential features of the concept of insurgency are semantic and substantive because it is difficult to define what insurgency is, in relation to what it is not. However, the definition of this (and every other) social phenomenon is necessary because it defines its...