A total of 11 Chinese and Russian navy ships sailed through waters near Japan's southern islands of Okinawa Prefecture on Thursday, prompting the Japanese government to express "grave concerns" over what it calls a show of force by its neighbors.The vessels headed into the East China Sea after passing through waters between the prefecture's main island of Okinawa and Miyako Island. It was the first time Chinese and Russian ships were spotted transiting that area together.The ships have apparently taken part in a joint patrol China and Russia recently conducted in the Pacific Ocean.The Japan…READ FULL ARTICLE