TY JOUR TI Impact of the migration situation in Russia on extremism and terrorism KW illegal migration KW terrorism KW extremism KW ethnic criminal groups KW digital space KW migrants KW special military operation KW migration processes KW law enforcement agencies JO Vestnik of the St. Petersburg University of the Ministry of Internal Affairs of Russia AU Bogdanov, A.V. AU Ilyinsky, I.I. AU Kudin, O.V. PY 2025 IS 2025 PB SAINT-PETERSBURG UNIVERSITY OF THE MINISTRY OF INTERNAL AFFAIRS OF THE RUSSIAN FEDERATION