Related Rule
Cuba
Practice Relating to Rule 161. International Cooperation in Criminal Proceedings
In 2009, in a statement before the Sixth Committee of the UN General Assembly on the obligation to extradite or prosecute and treaties over time, the representative of Cuba stated:
The Cuban delegation would like to emphasise that the obligation to extradite or prosecute is aimed at combating impunity, by ensuring that persons accused of certain crimes are denied safe haven and are brought to trial for their criminal acts.
We consider that the obligation to extradite or prosecute is based primarily on international treaties; and in the case of certain crimes of the most serious nature, it has acquired a character that may be considered customary.
Some of the crimes that include this obligation include genocide, war crimes, crimes against humanity … [and] torture. 
Cuba, Statement by the representative of Cuba before the Sixth Committee of the UN General Assembly on Item 81: Report of the International Law Commission on the Work of its 64th Session – Part IV: The Obligation to Extradite or Prosecute and Treaties Over Time, 2 November 2009, p. 1.