Japan made public Wednesday a map and aerial photos of 12 offshore structures as evidence of China's unilateral gas field development near the median line between its shoreline and that of Japan in the East China Sea.
Speaking at a news conference, Chief Cabinet Secretary Yoshihide Suga said Japan has known about the 12 on the Chinese side of the median line since June 2013. The total number of such structures there is now 16.
The map and 14 photos provided by the Defense Ministry have been made available on the Foreign Ministry's website.