Three Chinese government ships sailed into waters around disputed islands controlled by Tokyo today,the Japanese coastguard said.
The maritime surveillance vessels entered the 12-nautical-mile zone off Uotsurijima,one of the Senkakuislands,which China calls the Diaoyus,in the East China Sea shortly after 9:30 am (0600 IST),the coastguard added.
Ships from the two countries have been involved in a stand-off as Beijing and Tokyo jostle over ownership of the strategically important and resource-rich islands.
A territorial row that dates back four decades reignited last September when Tokyo nationalised three islands in the chain,in what it said was a mere administrative change of ownership.


