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International Convention against the Recruitment, Use, Financing and Training of Mercenaries, 4 December 1989.
States Parties shall co-operate in the prevention of the offences set forth in the present Convention, particularly by :
(a) Taking all practicable measures to prevent preparations in their respective territories for the commission of those offences within or outside their territories, including the prohibition of illegal activities of persons, groups and organizations that encourage, instigate, organize or engage in the perpetration of such offences;
(b) Co-ordinating the taking of administrative and other measures as appropriate to prevent the commission of those offences.