US naval ships regularly sail through the disputed South China Sea to assert freedom of navigation.
China's military on Tuesday claimed to have "expelled" a US Navy destroyer which sailed through the disputed South China Sea challenging Beijing's claims over the area.
US naval ships regularly sail through the disputed South China Sea (SCS) in a bid to assert freedom of navigation in the region.
China claims almost all of the 1.3 million square mile South China Sea as its sovereign territory. China has been building military bases on artificial islands in the region also claimed by Brunei, Malaysia, the Philippines, Taiwan and Vietnam.
China has impeded commercial activity like fishing or mineral exploration by countries like Vietnam and the Philippines.
On Tuesday, the Chinese People's Liberation Army (PLA) Southern Theater Command said that the US destroyer USS John S McCain "trespassed into waters near China's Nansha Islands (Spratly Islands), without the authorisation of the Chinese government".
"The PLA Southern Theatre Command organised naval and aerial forces and warned and expelled it," Senior Colonel Tian Junli, a spokesperson for the southern command, said in a statement.
The US warship's trespass came just a day after China's second aircraft carrier - Shandong - entered the South China Sea for exercises, said the China Military Online--the official Chinese military website.
China currently has two active aircraft carriers - Liaoning and Shandong.
Commenting on the latest incident, the website quoted analysts as saying that the PLA has again demonstrated its control over the region and ability to safeguard national sovereignty and security.
The US action was a serious violation of China's sovereignty and security, and it gravely disrupted peace and stability in the South China Sea, which China is resolutely against, Mr Tian said, stating that the command troops are on high alert at all times and will firmly carry out their duties and missions to safeguard national sovereignty and security as well as peace and stability in the region.
The US' "freedom of navigation" operations in the South China Sea have become routine since 2017, and by conducting a new one at this time, the Trump administration is using its last month to leave President-elect Joe Biden with more trouble in US-China relations, Chen Xiangmiao, an assistant research fellow at the National Institute for South China Sea Studies, told state-run Global Times on Tuesday.
The US has conducted similar operations nine times so far in 2020, the most often in the past five years, according to South China Sea Strategic Situation Probing Initiative, a Beijing-based think tank.
Mr Chen said that it remains uncertain if the US warship's trespassing is related to the Shandong's exercises, but it is unquestionable that the US warship came to provoke China.