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International Convention against the Recruitment, Use, Financing and Training of Mercenaries, 4 December 1989.
1. States Parties shall afford one another the greatest measure of assistance in connection with criminal proceedings brought in respect of the offences set forth in the present Convention, including the supply of all evidence at their disposal necessary for the proceedings. The law of the State whose assistance is requested shall apply in all cases.
2. The provisions of paragraph 1 of this article shall not affect obligations concerning mutual judicial assistance embodied in any other treaty.