Part Five. International Cooperation in the Sphere of Criminal Court Proceedings
Section XVIII. Procedure for the Interaction of Courts, Prosecutors, Investigators and the Inquest Bodies with the Corresponding Competent Bodies and Officials of Foreign States and with International Organizations
Chapter 54. Extradition of a Person for the Criminal Prosecution or for the Execution of the Sentence
Article 464. Refusal in the Extradition of a Person
2. 3) the criminal prosecution of the person, with respect to whom an inquiry for the extradition is sent is being conducted for the same act in the Russian Federation ;
Admissibility challenge - State investigation or prosecution
EDIT.