In recent years, China and Japan have been engaged in persistent maritime law enforcement competition in the waters surrounding Diaoyu Islands. There is a profound concern that the recent enhancement of their respective coast guards’ capabilities and mission scopes, coupled with a lack of mutual trust, may give rise to mutual misinterpretation of intentions. Such misjudgment has the potential to initiate a sequence of escalating reactions, ultimately culminating in armed conflict. The crucial factor in preventing this domino effect is the rational evaluation of the nature of maritime law enforcement operations conducted by both parties within the contested waters. Providing relatively objective evaluation criteria for these assessments is a critical role that international law can fulfill at this juncture. International judicial precedents have articulated a set of principles governing maritime law enforcement activities. Notably, the Guyana/Suriname case and the Detention of Three Ukrainian Naval Vessels case offered significant insights into the limitations on law enforcement operations in disputed maritime areas. Concurrently, both China and Japan have developed relatively comprehensive legal frameworks pertaining to the law enforcement activities of their respective coast guards. A better understanding of each other’s domestic legal regulations would also aid both China and Japan in avoiding misinterpretations of each other’s intentions. Indeed, through a comprehensive synthesis of the perspectives offered by international judicial bodies and a systematic analysis of each party’s domestic legal frameworks, this paper argues that, at least currently, neither party has exhibited intentions or actions that exceed the bounds of maritime law enforcement.
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