More drills, but now it is in the Pacific Ocean.

Once China's fleet was in the form of one large ornamental stone boat in the lake of the Summer Palace in Beijing. And Japan had a mighty fleet that was to destroy Czar Nicholas Fleet at Battle of Tsushima. Geographically, Japan is to the north of China. However along China's pacific litoral border are islands just as there are islands along the pacific japan's litoral border. So, in those days, Japan helped herself to them.
Things have changed today and here is the evidence:

http://english.peopledaily.com.cn/90786/8443272.html

This is now the basis that China wants to reclaim these islands that are along her Pacific litoral border. She has never asserted any claim of any Pacific islands on Japans Pacific litoral border.