General Part
Chapter II
Criminal Offences
Section 20. Joint Participation
(9) Voluntary withdrawal, by an organiser or instigator from the completing of commission of a criminal offence shall be considered as such only in cases when he or she, in due time, has done everything possible to prevent the commission with his or her joint participation of the contemplated criminal offence and this offence has not been committed. An abettor shall not be held criminally liable if he or she has voluntarily refused to provide promised assistance before the commencement of the criminal offence.
EDIT.