 :::We don't have to.  Wikipedia doesn't care what International Law is (to be honest, there is no such thing as international law, by the wayjust treaties and accords and conventions that nations enter into; not that this matters).  All Wikipedia cares is what reliable sources say.  Reliable sources say the islands are in dispute, so we must report that.  We cannot say who is right, although we are required to analyze the level of importance of each argument, and include the opinions in due weight to their representation in the real world. This is fundamentally what Wikipedia doescollect information from other sources, summarize it, and report it in encyclopedic format.  We do not make judgments about who is right or wrong.  Since it seems like you don't understand how Wikipedia works, I recommend you read three of our key policies, as they may help you understand: WP:V, which is the policy that requires that all information be verified, WP:NOR, which is is the policy that requires that we present only what others say and do not include our own original research, and WP:NPOV, which requires that we report the information neutrally, without giving inappropriate bias to one side or the other.    