Yes, have been following this very closely.
The new boldness is linked inextricably to the policies of one Mr. Barack Insane Obama, if you ask me (and many others in Japan and the Region nowadays).
Looking at a map that looks like Japanese waters to me.
Although I also know there is a huge US military presence on Okinawa. Did the US forces notice this fleet? Did it not share that with Japan?
Barack has certainly emboldened our adversaries.