International Convention against the Recruitment, Use, Financing and Training of Mercenaries was adopted by General Assembly in 1989 and cane into force in 2001. The convention defines who would come under the purview of “mercenary”. Any person who recruits, uses, finances or trains mercenaries commits an offence. A mercenary who participates directly in hostilities or in an act of violence, commits an offence. States parties should not recruit, use, finance or train mercenaries and should cooperate in the prevention of offences.
The convention does not exclude any criminal jurisdiction exercised in accordance with national law. Any state party can take the alleged offender in custody and take appropriate measures enabling any criminal or extradition proceedings. Fair treatment should be guaranteed to the alleged offender at all stages of proceedings. State party should communicate the final outcome of the proceedings to the Secretary General of United Nations.
Any dispute between two or more state parties regarding the interpretation or application of the convention which is not settled by negotiation, should be submitted to arbitration. And if the matter does not settle within six months, parties may refer it to International Court of Justice.