The weak law enforcement in international law often causes countermeasure to appear. Countermeasure is not only done by injured state but also by non-injured states. In this research, the two research questions are formulated: countermeasure regulations in international law and countermeasures legality by third party. This research applied normative legal research method conducted through library research. This research used legislation, historical and conceptual approach. Then, the data were analyzed qualitatively and the results of the study were analytical descriptively presented. The result of this research shows that countermeasure by injured state has been accepted under certain conditions. However, Countermeasure done by the third party remains controversial which means that the obscurity requires further regulation to avoid the abusive action.Keywords: Countermeasure, Injured State, Third Party
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