From "The Epoch Times" :

TAIPEI—According to the Mainland Affairs Council (MAC) of Taiwan's Executive Yuan 1 , between April and May of this year, the Navy of the Chinese People's Liberation Army (PLA) twice passed through the waters between the islands of Kkinawa and Miyako, through the East China Sea, to arrive in the South China Sea of the Eastern Pacific.

Some experts believe that China now has the military capacity to control the waters of the first chain of islands as its inland sea, and that China's next goal will be to construct an oceangoing navy, aimed at the second chain of islands and the entire western Pacific.
Full article here: http://en.epochtimes.com/news/7-11-15/61974.html