TY JOUR TI Classification of sources and formulae of strengthening international obligation to extradite or prosecute KW international cooperation in criminal proceedings KW obligation to either extradite or prosecute KW transfer of criminal justice (criminal prosecution) KW extradition of a person for a criminal prosecution JO Vestnik of the St. Petersburg University of the Ministry of Internal Affairs of Russia AU Slivinskaya, N.Y. PY 2025 IS 2025 PB SAINT-PETERSBURG UNIVERSITY OF THE MINISTRY OF INTERNAL AFFAIRS OF THE RUSSIAN FEDERATION