AFP, ABOARD THE USS THEODORE ROOSEVELT: Defence Secretary Ashton Carter on Thursday visited a US aircraft carrier in the South China Sea, where he took a jab at Chinese actions that have been blamed for raising tension in the disputed waterway. Carter flew to the USS Roosevelt—an enormous, nuclear-powered supercarrier—as it churned through international waters about 150-200 nautical miles south of where China is constructing artificial islands to underpin its expansive claims to the region. “There’s a lot of concern about Chinese behaviour out here,” Carter said aboard the ship.