摘要：The article analyzes the concept of “extremism” in national and international law, examines the problem of criminalization of extremism in the legislation of the Russian Federation, foreign states and international legal acts, identifies lacunas and contradictions in the legal regulation of relations aimed at countering extremism, it is argued that legal certainty is one of the factors of the effectiveness of international cooperation in the fight against extremism and terrorism.
关键词：extremism; extremist act; extremist activity; terrorism; legal nihilism; international cooperation
