The Chinese military is building base facilities that are of large-scale in East China Sea's Senkaku Islands, China-based sources claimed on Sunday.

According to reports, constructions are already underway in the Nanji Islands located in Zhejian Province. The site, which China calls "Diaoyu, is at 300 km northwest of the uninhibited Senkakys islands in the East China Sea and is controlled by the Japanese.

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The constructed base is expected to enhance the readiness of China in responding to any military crises that might arise in the future not only in the region but also from outside forces. It is also in an effort to strengthen the surveillance of China's air defense identification zone that has been declared on November 2013.

Other sources are saying that there have been several large radar installations in another island called Nanji. These radars are said to have been built at the high points of the island.

There were also landing strips that have been built and sources say that these will be used for aircraft based warships or patrol vessels. They will reportedly build more landing strips on the island adjacent to Nanji  starting next year.

Critics say the bases might shake the Japan-U.S. partnership in securing the Senkakus Islands. The main Island of Okinawa, just 100 km close to Senkakus, is home to the Self-Defense Forces as well as the U.S. military.

Reports also say that the expansion of China in the East China Sea has come after the Japan-China relationship continues to be stained by the territorial and historical issues of the two countries. It has worsened when Japanese Prime Minister Shinzo Abe had a meeting with Chinese President Xi Jinping just this November in Beijing.

The expansion is set to cause at least 2,500 civilians who are living in the said islands to be relocated. The residents' livelihood are mainly fishing and tourism.

Tagssenkaku, China military, military facility