中國反對日本成為安理会常任理事(維基解密)

Recently the Yomiuri News reported the following:

日本の国連安全保障理事会常任理事国入りについて、中国が強い反意を米国に伝えていたことなどが、内部告発サイト「ウィキリークス」が順次公開している米国務省の外交公電で明らかになった。
　同サイトによると、中国の外務次官は昨年４月、北京の米大使館関係者に対し、国連安保理の常任理事国が１０か国に倍増すれば、米中関係は「厄介なことになる」とし、「中国国民にとって日本を常任理事国として受け入れることは困難だ」と伝えた。これに対し、米大使館関係者は「国連予算の第２位の拠出国・日本を含まない拡大は考えにくい」と答えていた。
　また、中国当局者は昨年６月、北京の米大使館関係者に、「北朝鮮の拉致問題に執着する日本は、物事を壊す力は持っているが、解決する力は持たない」と述べた。さらに昨年４月の公電で、中国の外務次官は、米国との直接交渉を望む北朝鮮について、「（米国などの）『大人』の関心を引こうとする『駄々っ子』のようだ」と発言。中国側が北朝鮮の存在を持て余している様子がうかがえる。

It was clarified in the whistle-blowing site "WikiLeaks" which opened up diplomatic official telegrams of the State Department one by one, that China had been telling the United States its strong objection over giving a permanent UN Security Council membership to Japan.

According to the same site, last April, China Foreign Secretary's official related a message to people who had ties with US. embassy in Beijing saying that if doubling the permanent membership of U.N. Security Council to ten countries, Sino-U.S. relationship would "Become a troublesome thing", and told that "It is difficult for the Chinese people to accept Japan as a permanent member". The person who had ties with the U.S. embassy answered that "It is not easy to think of an expansion which Japan as the 2nd place donor country of the United Nations budget was not included".

Moreover, Chinese officials said to the people in Beijing who were related to the U.S. embassy last June that "Japan was attaching too much importance to the abduction issue caused by North Korea and that had a force of messing up things instead of being a force for solving problems". In addition, in the opened up official telegrams, in April last year, China Foreign Secretary's officials remarked that "Regarding North Korea it always hoped for a direct negotiation with the United States and tried to draw attention of "adults" (the United States etc.) like a spoiled child." It looked as if China was unable to manage North Korea.

The hearsay is interesting but not unfamiliar. I am wondering if China could give a better reason for rejecting Japan to become a member of the UN Security Council.