The Chinese ships have not followed the coast guard's order to leave the territorial waters, a Japan coast guard official said.
Tension flared last month when Japan detained a group of Chinese activists who had landed on the islands, known as Senkaku in Japanese and Diaoyu in Chinese.
Bilateral ties were strained further on Tuesday when Japan, which controls the islands, said it had bought them from a private owner, ignoring warnings from China






![Introducing Skywhale: Canberra, Australia’s Controversial $300K Centenary Balloon [PHOTOS] Introducing Skywhale: Canberra, Australia’s Controversial $300K Centenary Balloon [PHOTOS]](http://s1.ibtimes.com/sites/www.ibtimes.com/files/styles/v2_medium/public/2013/05/14/skywhale.jpeg)
![Meet Ahmed Angel: The Greatest Internet Superstar. Ever. [PHOTOS] Meet Ahmed Angel: The Greatest Internet Superstar. Ever. [PHOTOS]](http://s1.ibtimes.com/sites/www.ibtimes.com/files/styles/v2_medium/public/2013/05/14/ahmed-angel.jpg)


![Airbus Shows Off The First A350 XWB, The Boeing 787's Rival [PHOTOS] Airbus Shows Off The First A350 XWB, The Boeing 787's Rival [PHOTOS]](http://s1.ibtimes.com/sites/www.ibtimes.com/files/styles/v2_multimedia/public/2013/05/13/a350.jpg)

![Lisalla Montenegro: Meet Angels Pitcher C.J. Wilson’s New Supermodel Fiancé [PHOTOS] Lisalla Montenegro: Meet Angels Pitcher C.J. Wilson’s New Supermodel Fiancé [PHOTOS]](http://s1.ibtimes.com/sites/www.ibtimes.com/files/styles/v2_medium/public/2013/05/10/lisalla-montenegro_3.jpg)















Like or Follow us for updates on the biggest stories!