At the end of WW2 the USA took control over the senkaku islands
however in 1971 the senate passed the Okinawa reversion treaty
giving back the islands to japanese control in 1972.
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Senkaku islands in Japanese.
Diaoyu in Chinese.
As a whole: Okinawa prefecture
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The Diaoyu Islands or the Senkaku Islands as they are sometimes
known are under the administration of Japan. However they are also
claimed by China and Taiwan.