GENERAL PART
Section one. Basic provisions
CHAPTER 2. LIMITS OF APPLICATION OF CRIMINAL CODE
Article 13. Application of Law in Time
A law decriminalizing an act, mitigating a penalty or otherwise improving the position of a person, shall be retroactive, that is, shall be applied to persons, who had committed the appropriate act before this law came into effect, as well as to persons, who are serving their penalty or have served it with non-cancelled conviction.
A law criminalizing an act, severing a penalty or otherwise worsening position of a person, shall not be retroactive.
EDIT.