The destroyer Uss Dewey sailed within 12 miles of one of the artificial islands built by China in Spratly, in the controversial waters of the South China Sea, in the first operation on Trump’s “freedom of navigation”. China has sent two frigates who have “warned and removed” Dewey after entering the territorial waters “without permission,” the spokeswoman for the Ministry of Defense said. “We have filed a serious complaint to the American side,” he added.