Given the far-reaching impact of the decades-long discharge of Fukushima nuclear contaminated water, Japan and States likely to be affected are unequivocally obligated to cooperate under the United Nations Convention on the Law of the Sea, nuclear safety conventions and relevant customary international law. The fulfilment of the duty to cooperate, however, encounters two primary challenges in practice: the intrinsic nature of the cooperation is discretionary, while the extrinsic form of the duty is polymorphic. Realising the two challenges that are yet to come, this paper contextualises the fulfilment of the duty to cooperate by proposing a three-dimensional cooperation as the potential pathways, namely bilateral communication, regional cooperative arrangement, and multilateral cooperation through competent international organisations. It makes inquiry into the feasibility and effectiveness of the cooperation based on the fundamental principle of good faith, and concludes that States should actively engage to strike a necessary balance between national interest and common interest to protect human health and the environment under this specific context.
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