China sends J-10 fighters to counter Japanese F-15J

China’s Ministry of National Defense on Friday denounced Japanese military aircraft disrupting the routine patrols of Chinese administrative aircraft.
At a press conference, an official with the ministry confirmed that China sent two J-10 fighters to the East China Sea after a Y-8 aircraft was closely followed by two Japanese F-15 fighters as it patrolled the southwest airspace of the East China Sea oil platform on Thursday.
The two J-10 fighters were sent to monitor the Japanese fighter jets tailing the Y-8 as well as another Japanese reconnaissance plane spotted in the same airspace, the official said.

Furthermore, the official said Japanese military aircraft have been increasingly active in closely scouting Chinese aircraft. The activity zone of Japanese military aircraft has also expanded recently, which is the root cause of security disputes concerning territorial waters and airspace between the two countries.
The Chinese military will be on high alert and China will resolutely protect the security of its air defense force and uphold its legitimate rights, the official said.
The official also called for the Japanese side to respect relevant international laws and to prevent security disputes by taking effective measures.

Japan mulls spy drones for East China Sea

Moves come in response to a report that China has transferred two destroyers and nine other former navy vessels to its maritime surveillance fleet.

JAPAN is considering introducing US spy drones to boost surveillance of its territorial waters near islands in the East China Sea at the centre of a bitter dispute with Beijing, Kyodo News says.
The Japanese defence ministry hopes to introduce the unmanned Global Hawk aircraft by 2015 "in a bid to counter China's growing assertiveness at sea, especially when it comes to the Senkaku Islands", the news agency said, citing unnamed government officials.
Beijing has been sending maritime patrol vessels into waters around the Japanese-controlled islands, which China claims as Diaoyu, since Tokyo nationalised the chain in September.
China is apparently seeking to prove that it can come and go in the area at will, and on Monday three of Beijing's ships were spotted in the waters around the islands, according to Japan's coastguard, in the latest perceived incursion.