Sanctions applied against Sierra Leone and Liberia by the UN security council are phased and have fared differently. UN sanctions were first imposed on Sierra Leone in 1997 and on Liberia in 1992 and were mostly symbolic in nature. This changed in 2000 through proactive monitoring by expert panels - individuals hired by the UN as consultants for a limited time to provide advice and counsel to the appropriate sanctions committee.
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Vines et al. (2010) studied this question.
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