The Defense Ministry plans to build a communications intelligence facility on Iwoto Island in the Pacific to improve its ability to conduct surveillance on China and its growing military presence, a government source said Thursday.

The ministry's budget request for next fiscal year includes part of the ¥12 billion needed to build the facility, which would come online in fiscal 2017, the source said. Iwoto, about 1,250 km south of Tokyo, used to be known as Iwojima and was the site of a terrible battle during World War II. Defense Minister Itsunori Onodera will visit the island early next month.

The ministry has similar facilities at six locations, including in Hokkaido, to intercept communications between ships and aircraft.