国際司法裁判所PULAU LIGITAN AND PULAU SIPADAN

The Court observes that these three islands are surrounded by many smaller islands that could be said to “belong” to them geographically. The Court, however, considers that this cannot apply to Ligitan and Sipadan, which are situated more than 40 nautical miles away from the three islands in question.

---

そもそもサンフランシスコ条約には「belong」さえ書かれてないわけで。
どうあがいても、鬱稜島から90km離れた竹島を鬱稜島に含めて放棄したと解釈することはできません。