Règle correspondante
Japan
Practice Relating to Rule 161. International Cooperation in Criminal Proceedings
Section D. Political offence exception to extradition
Japan’s Law on Extradition (1953), as amended in 2004, states:
A fugitive shall not be surrendered in any of the following circumstances …:
(1) When the offence for which extradition is requested is a political offence;
(2) When the request for extradition is deemed to have been made with a view to trying or punishing the fugitive for a political offence which he has committed. 
Japan, Law on Extradition, 1953, as amended in 2004, Article 2.1(1) and (2).