The boats were in Japan 's `` contiguous zone '' but did not cross into Japanese territorial waters , Kyodo reported , sourcing Japan 's coast guard . Japanese patrols make Japan 's government `` uncomfortable '' Chinese media reports patrols did not cross into Japanese territorial waters . Japanese diplomatic protest comes the next four years after raucous anti- China protests in Japan .
Japanese patrols make Japan 's government `` uncomfortable '' Chinese media reports patrols did not cross into Japanese territorial waters . Japanese diplomatic protest comes the next four years after raucous anti- China protests in Japan .