Tokyo woke up Thursday to hints of a nightmare scenario in what it considers its backyard. Just after midnight, the Japan Maritime Self-Defense Force sighted a Jiangkai I frigate from the Chinese People's Liberation Army Navy within the 24-nautical mile contiguous zone of the Senkaku Islands in the East China Sea. The ships lingered for about two hours near the Senkakus, which Japan controls but China also claims (the Chinese know them as the Diaoyu Islands). A People's Liberation Army Navy ship has never been spotted so close to the Senkakus. To make matters worse for Tokyo, three Russian navy ships, including an Udaloy-class destroyer, passed through the contiguous waters during the same period....