Article 6.
5. A law or another normative legal act that establishes new obligations or aggravates liability shall have no retroactive effect.
Article 60.
1. A law establishing or aggravating the liability of a person shall not have retroactive force.
No one may be held liable for acts which, at the time they were committed, were not recognized as an offence. If, after an offence has been committed, the liability for the offence is removed or mitigated, a new law shall apply.
Article 12. Retroactive effect of criminal law in time
1. A law that abolishes the criminality of an act or mitigates the criminal consequences of a criminal act has retroactive effect, that is, it applies to persons who committed the relevant act before such law came into force, including persons serving a sentence or who have served one.
2. A law establishing the criminality of an act or increasing the criminal consequences of a criminal act shall not have retroactive effect.
3. A law that partially mitigates and partially toughens the criminal consequences of an act has retroactive effect in time only to the extent that it mitigates these consequences.
4. If the criminal law has changed several times between the time the crime was committed and the time the sentence was passed, the most lenient law is applied.
5. Compulsory measures of an educational and medical nature shall be applied only on the basis of the law in force at the time the case is being resolved in court.
GENERAL PART
SECTION I. GENERAL PROVISIONS
CHAPTER 1. MAJOR PROVISIONS
Article 3. Limits for Application of the Criminal Procedure law
(6) Criminal procedure law charging new responsibilities on, directly or indirectly revoking or derogating the right of the proceeding’s participants, limiting their application by special conditions, shall have no retroactive effect.
2. If a State becomes a Party to this Statute after its entry into force, the Court may exercise its jurisdiction only with respect to crimes committed after the entry into force of this Statute for that State, unless that State has made a declaration under article 12, paragraph 3.
1. No person shall be criminally responsible under this Statute for conduct prior to the entry into force of the Statute.
2. In the event of a change in the law applicable to a given case prior to a final judgement, the law more favourable to the person being investigated, prosecuted or convicted shall apply.