Updated satellite images taken by Imagesat Eros B intelligence satellite acquired by ISI on 14/2/16 reveal a deployment of Chinese HQ-9 (the Chinese S-300 equivalent) Surface to Air Missile (SAM) system now positioned in "Woody Island", previous images obtained by the same source on February 3, 2016 did not show presence of such weapons on the island.
This deployment is likely the first Chinese deployment of heavy SAM system in the spratly (paracel) archipelago in the South China Sea — an area of many island and atolls claimed by China, Taiwan, Vietnam, Philippines, Malaysia and Indonesia. The Woody Island claimed by Vietnam, was seized by China in 1974.
Using it's very high resolution satellite, ISI Analysis team has identified the SAM systems with high confidence as the HQ-9 system. With an operational range of 200 km at high altitude, the HQ-9 pose a threat to military and civilian air traffic.