Chinese Defense Minister Liang Guanglie (L) hosts a welcoming ceremony for U.S. Secretary of Defense Leon Panetta in Beijing, capital of China, Sept. 18, 2012. Liang Guanglie held talks with Leon Panetta in Beijing on Tuesday. (Xinhua/Yao Dawei)

By Lintao Zhang 
BEIJING, CHINA - SEPTEMBER 18: Chinese Paramilitary Policemen stand guard during an anti-Japan protest outside the Japanese Embassy on September 18, 2012 in Beijing, China. Protests have taken place across China in a dispute that is becoming increasingly worrying for regional stability.

A Chinese paramilitary policeman kicks away a shoe thrown by a demonstrator during an anti-Japan protest outside the Japanese Embassy in Beijing Saturday, Sept. 15, 2012. Protests against Japan for its control of disputed islands spread across more than a dozen cities in China and turned violent at times Saturday, with protesters hurling rocks at the Japanese Embassy and clashing with Chinese paramilitary...

Chinese demonstrators raise national flags as they confront riot policemen during a protest against Japan in Shenzhen, China Sunday, Sept. 16, 2012.

Anti-Japanese protesters are confronted by police as they demonstrate over the disputed Diaoyu Islands, on September 16, 2012 in Shenzhen, China. Protests have taken place across China in a dispute that is becoming increasingly worrying for regional stability. (Photo by Lam Yik Fei/***** Images

A demonstrator yells slogans as the police block protesters from accessing the American consulate, during a protest against Japan's decision to purchase disputed islands, called Senkaku in Japan and Diaoyu in China, in Chengdu September 16, 2012.

Armed paramilitary police officers stand guard as demonstrators protest against Japan's decision to purchase disputed islands, called Senkaku in Japan and Diaoyu in China, in Tianfu Square, Chengdu September 16, 2012. *******/Jason Lee

Demonstrators waving Chinese flags shout as a police helicopter flies overhead during a protest against Japan's decision to purchase disputed islands, which Japan calls the Senkaku and China calls the Diaoyu, in Shenzhen, south China's Guangdong province September 16, 2012. *******/Tyrone Siu

A Chinese demonstrator kicks a broken police vehicle during a protest against Japan in Shenzhen, China Sunday, Sept. 16, 2012. Protesters in China began another day of demonstrations against Japan, after protests over disputed islands spread across numerous cities and at times turned violent. (AP Photo/Apple Daily)

Chinese demonstrators raise national flags as they confront riot policemen during a protest against Japan in Shenzhen, China Sunday, Sept. 16, 2012. Protesters in China began another day of demonstrations against Japan, after protests over disputed islands spread across numerous cities and at times turned violent. (AP Photo/Apple Daily)

Chinese demonstrators clash with policemen at the barricades during an anti-Japan protests outside the Japanese Embassy in Beijing Saturday, Sept. 15, 2012. (AP Photo/Andy Wong)