in Tokyo...
But commandos everywhere...
The Chinese name and kanji expression of the Senkaku Islands is from an old calling of the main island of the Islands by old Okinawa people, according to a Japanese researcher.
(Click to enlarge; http://akebonokikaku.hp.infoseek.co.jp/page089.html#2.2.4 魚釣島の名の由来 )
Chinese can speak English more easily than Japanese do, since the verb-object sequence is the same between the Chinese and English languages.
But, in Japanese, an object always follows a verb.
And, 500 years ago, Chinese fishermen living on the coastal areas of the Chinese Continent had no reason to sail to the Senkaku Islands 400 km (250 miles) off the shore to catch fish, risking their lives.
Only imperial envoys Chinese emperors sent would dare to sail 700 Km (438 miles) across the East China Sea to the main island of the Kingdom of Okinawa 500 years ago.
But, Okinawa people at the time were already sailing all over the Okinawa (Ryukyu) Islands that stretched over 800 Km. And, the nearest big Okinawa island to the Senkaku Islands is located just 190 Km (102 miles) away. They were really fishing around the Senkaku Islands 500 years ago.
It is also unthinkable that Okinawa People took the Chinese name of the Islands, meaning "angling for fish" as their own, too. It is more unthinkable that they took the Chinese name of the Islands, meaning "angling for fish" through changing the word order.
Therefore, a Chinese imperial envoy who dared to sail to the Kingdom of Okinawa, a tributary nation of the Ming Dynasty, for a diplomatic reason in the 16th century, must have adopted the Okinawa people's calling "Tsuri"-shima, namely an "angling" island. But, no Chinese fishermen could and would go and catch fish around the Senkaku Islands 400 km (250 miles) off the shore 500 years ago, since it was a dangerous voyage even for a Chinese imperial envoy using a big ship.
In addition, the concept of a border for a Chinese classic empire was different from the one for us, the modern people of today.
As the Kingdom of Okinawa was a tributary nation, the Ming Dynasty and later the Ching Dynasty had no need to define a border on the sea where any of their subjects lived. Ming and Ching had to protect their people from notorious Japanese pirates who ignored any border, if any, on the East China Sea. Okinawa never made war against its master empire in China. Naval security needed maps and definition of administrative/defence zones on the Chinese side, but it was not for claiming its border to its subject nation Okinawa.
If an emperor of Ming or Ching had pronounced its occupancy of the Senkaku Islands (or the "Cho-gyo-dai" Islands in Japanese for today's Chinese name of the Senkaku Islands) on the king of Okinawa, the king would have simply accepted it. But, there was even no such a need in the classic world of East Asia.
Finally, Okinawa was forced to officially belong to a Japanese samurai clan whose territory included islands north of the Okinawa Islands officially in 1611. The samurai clan Shimazu also belonged to Tokugawa shogunate in Edo (Tokyo). So, Okinawa was subject to both Japan and China nominally till the end of the Japan-Sino War in 1895, 27 years after the fall of the Tokugawa regime and the restoration of the imperial authority in Japan of 1868.
So, the "Uo-tsuri"-jima Island and other Senkaku islands have always belonged to Okinawa that belongs to Japan since 1611 (or since Okinawa people's ancestors' descending to the south from Japan proper thousands of years ago from a racial point of view, since the Okinawa language is one of dialects of the Japanese language, though very unique).