TY JOUR TI Problems of defining and distinguishing the concepts of «Extremism» and «Terrorism» in criminal law science KW criminal law science KW differentiation of concepts KW extremism KW terrorism KW national security KW public safety KW criminal ideology KW legal definitions KW radicalization KW law enforcement practice KW state security JO CRIMINOLOGICAL JOURNAL AU Gusaim, I.V. PY 2026 IS 0 PB Moscow University of the Ministry of Internal Affairs of Russia named after V.Ya. Kikot