20/May/1920 There was a description about the Diaoyu Islands as "Senkaku Islands of Okinawa prefecture in Japan" on the grateful letter for Japan's rescue for fishing people by Chinese government.
20/May/1920 There was a description about the Diaoyu Islands as "Senkaku Islands of Okinawa prefecture in Japan" on the grateful letter for Japan's rescue for fishing people by Chinese government.
08/Jan/1953 People's Daily (Chinese Central Committee's official publication) posted the article titled "Ryukyu people's struggle against the American occupation", which explains the Diaoyu Islands as "Senkaku Islands" and a part of Okinawa.
Nov/1958 the publishing company in Beijing published "World map collection", which depicted the island as "Senkaku Islands owned by Japan".
Oct/1965 Ministry of National Defense (Republic of China) published the first edition of "World map 1st collection - East Asia", which depicted the island as "Senkaku Islands owned by Japan".
Jan/1970 the first edition of Taiwanese government-designated textbook for secondary school's geography was published , and it explained the Diaoyu island as "Senkaku Islands owned by Japan".
1969-1970 the UN reported the reserve assessment of oil near to the Diaoyu Islands, which is about 109.5 billion barrels (about the same amount of the oil in Iraq and more than Kuwait and UAE).
30/Dec/1971 Chinese government (Chinese Foreign Minister) officially staked a claim to the Diaoyu island in the first time.
According to China (and Taiwan)'s official perspective to this island, it is pretty much obvious why China's started to claim that the Diaoyu Islands is owned by China. Actually, before the UN's report, China was not interested in those valueless small islands at all.