In the article, the problem of information security of Ukraine at the present stage of development in the context of the information society evolution was analysed. The theoretical approaches to the definition of the essence of the concept of “cybersecurity”, “cyberspace” by Ukrainian and foreign scientists were discovered. It is determined that these concepts are widely used in modern science, but there is still no their clearly defined meaning, which, accordingly, complicates scientific comprehension and practical overcoming of problems and threats in the information space of Ukraine and harms the national interests of the state. The legal framework of Ukraine, which regulates the sphere of information security, in particular, legal acts adopted since 2014, were described. It has been proved, that cybernetic attacks on state information resources have become an integral part of the hybrid war, unleashed by Russia. It is indicated that with the onset of Russian military aggression, the transformation of national information legislation, including the one on cybersecurity, took place. The priority directions of the state policy in the field of ensuring the cybernetic security of Ukraine in the conditions of hybrid war were researched.