Today in coastal cities like Shanghai and Guangzhou. Military aricraft are flying above cities. Sources say China is getting serious on the Diaoyu Island issue and troops are gearing up for the upcoming military conflict if Japan doesn't back up.

Google translate

Nanfang Daily (Reporter / Liu Huaiyu), Guangzhou City, will be organized in morning air defense exercise will test the air defense warning, the public need not panic.

Guangzhou People's Air Defense Sector, air raid sirens will be 11:30-11:48 am today, in the city (10 districts, two county-level cities) within pilot Ming. The ringing methods include early warning, air raid sirens and disarm the alarm. Including an early warning for the Naruto 36 seconds, 24 seconds off, repeated three times, a time of 3 minutes; air raid sirens Ming 6 seconds, six seconds off, repeated 15 times, a time of 3 minutes; disarm the alarm sounds continuously for 3 minutes.

Time, fixed in Guangzhou sirens, mobile air defense alert cars and some multimedia multi-functional anti-aircraft disaster warning annunciation system, the simultaneous release of the air-raid siren signal; the the Guangzhou TV 34 channels and the Guangzhou People's Radio News broadcast Melody music radio, Economy and Transport broadcast channels and bus mobile TV, Guangzhou Metro TV, will be released simultaneously on the air-raid siren signal; Guangzhou Branch of China Telecom, China Mobile Guangzhou Branch, China United Network Communications Co., Ltd., Guangzhou Branch and city departments will be form of mobile phone text messages synchronized blasts of air raids.