In the last three years, the term “hybrid warfare” is being actively applied in political context. However,legal aspects of this phenomenon remain insufficiently studied. As a result, there is a dangeroussituation when the term reflecting real tendencies in the sphere of military and informational policy ofthe states gradually takes root into research terminology, without any appropriate legal content yet.Nowadays there is a serious discussion about the possibility of using this term in a legal context andabout the opportunities of its further inclusion into international legal terminology. The phenomenonof “hybrid warfare” shows sharp increase of the importance of informational component ininternational relations. It also represents the logical continuation of practical implementation of theconcept of “color revolutions” and “Arab springs” which mainly deal with non-military impact onthe opponent. The author believes that the prospects of inclusion of the term “hybrid warfare” interminology of international law are very nebulous, taking into account that there have been legalterm “state terrorism” for more than three decades, with a very similar sense, which has not yetbecome a subject of international legal regulation in the specialized convention. Moreover, the factthat “hybrid warfare” became a journalistic cliche for designation of actions of the states are not fittinginto a framework of a traditional military paradigm, has extremely bad effect on the prospects of legal regulation of this phenomenon. Besides, the information and communication sphere represents toodifficult subject of legal regulation due to its dynamism. The author points out the most significantinternational legal issues arising from legal connotation of the term “hybrid warfare”, including theproblem of conducting direct analogies between the classical military categories and the categoriesof “hybrid war”. In this context, the problem is whether cyber-attacks can be considered as a basisfor the state self-defense, as well as whether actions of states during “hybrid war” can be consideredas the basis for the international responsibility of states.