China has called the United States a “risk creator” in the South China Sea, after an American warship sailed through Chinese territorial waters near the disputed Spratly Islands. China’s military said on Thursday that the USS Curtis Wilbur, a guided-missile destroyer, had illegally entered the waters near the Chinese-claimed Islands without permission and then had been warned and sailed away. Colonel Tian Junli, a spokesman for the People’s Liberation Army Southern Theater Command, said such actions “increase regional security risks, which easily causes misunderstandings, misjudgments and unforeseen maritime incidents.”