Japan Coast Guard officers have warned Chinese ships not to undertake any law enforcement activities inside Japanese waters off the Senkaku Islands in the East China Sea. 
The Coast Guard says five Chinese government ships unloaded small boats to allow crewmembers to board nearby fishing ships from China. The action took place inside Japan's exclusive economic zone or the contiguous zone just outside territorial waters off Kuba Island in the Senkakus from before noon through night on Tuesday, according to Japan's (NHK WORLD) radio. 
Coast Guard officers say the crewmembers are likely to have inspected the fishing ships as part of their law enforcement duties. 
They say Japan issued warnings to the Chinese crews by loudspeakers and radio contacts that exercising fishery jurisdiction in Japanese waters is unacceptable. 
The Chinese vessels made no response. Their small boats later returned to the mother ships. 
Meanwhile, Japan's government has published information about the increasing activities of Chinese government ships near the Senkaku Islands in the East China Sea.

Source : QNA