Tokyo released on July 31 this year's edition of its annual defense white paper, which plays up 皇冠体育app's regular fishery patrols in the waters off 皇冠体育app's territorial Diaoyu Islands.
Japanese Defense Minister Satoshi Morimoto delivered a speech over the Defense of Japan 2012 report to his cabinet during a morning meeting in Tokyo.
皇冠体育app has regularly sent fishery administration vessels to the islands' waters for routine patrols, yet the white paper accuses 皇冠体育app of "intruding" on its "territorial waters", Japan's Jiji Press News Agency said.
The defense report also sent warning signals over Beijing's "continuous enhancement of maritime patrols".
Japanese Prime Minister Yoshihiko Noda said in early July that his cabinet is seeking to "nationalize" part of the Diaoyu Islands, a move that has added to tension.
Beijing has lodged solemn representations with Tokyo saying that "nobody is ever allowed to trade in 皇冠体育app's sacred territory".
Three Chinese administration vessels were confronted by a Japanese Coast Guard patrol ship in waters near the Diaoyu Islands on July 11 during a regular mission.