Règle correspondante
Sweden
Practice Relating to Rule 161. International Cooperation in Criminal Proceedings
Sweden’s IHL Manual (1991) notes that the 1977 Additional Protocol I “states that the contracting parties shall to the greatest extent possible assist each other in connection with penal procedures instituted as a consequence of grave breaches of the [1949] Geneva Conventions or [the 1977 Additional Protocol I]”. 
Sweden, International Humanitarian Law in Armed Conflict, with reference to the Swedish Total Defence System, Swedish Ministry of Defence, January 1991, Section 4.2, p. 97.
Sweden’s IHL Manual (1991) notes:
Additional Protocol I … states that the contracting parties shall to the greatest extent possible assist each other in connection with penal procedures instituted as a consequence of grave breaches of the Geneva Conventions or the Protocol. The States shall also cooperate in extradition cases …
In the extradition request the government can refer to the article in Additional Protocol I concerning mutual assistance in criminal proceedings ([the 1977 Additional Protocol I], Art. 88:2), according to which due consideration shall be given to a request for extradition from the state in whose territory the alleged offence has occurred. 
Sweden, International Humanitarian Law in Armed Conflict, with reference to the Swedish Total Defence System, Swedish Ministry of Defence, January 1991, Section 4.2, p. 97.
Sweden’s Cooperation with the International Tribunals Act (1995), as amended, states:
This Act applies in relation to
- the International Criminal Tribunal for the Former Yugoslavia established by the United Nations Security Council on 25 May 1993, and
- the International Criminal Tribunal for Rwanda established by the United Nations Security Council on 8 November 1994.
Should either of the Tribunals request legal assistance of Sweden, the requested measure shall be taken in accordance with the provisions of this Act. 
Sweden, Cooperation with the International Tribunals Act, 1995, as amended, Section 1.
In 2002, Sweden enacted the Cooperation with the International Criminal Court Act (2002), which provides for cooperation with the ICC in “the investigation or prosecution [related] to genocide, crimes against humanity or war crimes”, “the investigation or prosecution [related] to an offence against the administration of justice by the International Criminal Court”, and “on enforcement of the rulings of the International Criminal Court and on the transit through Sweden of persons deprived of their liberty”. 
Sweden, Cooperation with the International Criminal Court Act, 2002, § 1.