The US will send a "clear signal" to China that it must abandon its artificial islands in the South China Sea, Donald Trump's secretary of state pick Rex Tillerson has warned, hitting out at the communist giant for its "extremely worrisome" activities in the disputed waters. "We're going to have to send China a clear signal that first, the island-building stops, and second, your access to those islands also not going to be allowed," the 64-year-old former ExxonMobil CEO told the Senate Foreign Relations Committee during his confirmation hearing yesterday. "China's activity in this area is extremely worrisome and I think, again, a failure of a response has allowed them just to keep pushing...