The Chinese military is constructing a new counter-stealth radar system on a disputed reef in the South China Sea that would significantly expand its surveillance capabilities in the region, satellite imagery suggests. Analysis by Chatham House suggests China is upgrading its outpost on Triton Island, on the south-west corner of the Paracel archipelago, building what may be a launching point for an anti-ship missile battery, as well as the sophisticated radar system. “By constraining the US ability to operate stealth aircraft, and threaten stealth aircraft, these capabilities in the South China Sea send a powerful signal to US allies and