A satellite image released by the Asian Maritime Transparency Initiative at Washington's Center for Strategic and International Studies shows construction of possible radar tower facilities in the Spratly Islands in the disputed South China Sea in this image released on February 23, 2016. Mandatory credit CSIS Asia Maritime Transparency Initiative/DigitalGlobe/Handout via Reuters

A satellite image released by the Asian Maritime Transparency Initiative at Washington’s Center for Strategic and International Studies shows construction of possible radar tower facilities in the Spratly Islands in the disputed South China Sea in this image released on February 23, 2016. Mandatory credit CSIS Asia Maritime Transparency Initiative/DigitalGlobe/Handout via Reuters

A satellite image showing construction of possible radar tower facilities in the Spratly Islands in the disputed South China Sea in this image released in Feb 2016. Photo: CSIS Asia Maritime Transparency Initiative/ DigitalGlobe/ Handout via Reuters

July 14, 2016 1:24 PM (UTC+8)