The US has accused a Chinese naval ship of conducting "unsafe and unprofessional" manoeuvres when one of its warships entered the waters of the disputed South China Sea. China on Tuesday expressed its strong dissatisfaction and firm opposition to the US warship sailing near the islands and reefs claimed by it in the South China Sea (SCS).

"On September 30, without permission of the Chinese government, the US destroyer Decatur entered neighbouring waters of islands and reefs of China's Nansha Islands," Chinese Foreign Ministry spokesperson Hua Chunying said in a statement on Tuesday.