China on Monday said the United States was responsible for "deliberate stirring up" of tensions in the South China Sea, after a US warship navigated through waters claimed by Beijing.
"On December 4, littoral combat ship USS Gabrielle Giffords illegally entered the waters adjacent to Ren'ai Reef in the Nansha region of China without the approval of the Chinese government," Southern Theatre Command spokesman Tian Junli said.
The Second Thomas Shoal -- referred to in Chinese as Ren'ai Reef -- is about 200 kilometres (125 miles) from the western Philippine island of Palawan, and more than 1,000 kilometres from China's nearest major landmass, Hainan island.
China's military on Monday "followed the entire operation", said Tian, adding that the "deliberate stirring up of the South China Sea by the United States is a serious infringement of China's sovereignty and security".
"Troops in the theatre of command maintain a high state of alert at all times, resolutely defending national sovereignty and security".
Beijing has ignored a 2016 ruling by the Permanent Court of Arbitration in The Hague that its claims to almost the entire sea have no legal basis.
China has ramped up patrols of the waters and reefs in the South China Sea over the past decade or so, and built artificial islands that it has militarised to reinforce its assertion.
France urges Beijing to help avert 'crisis'
France's top diplomat urged Beijing on Monday to re-think its assertive behaviour in the South China Sea, saying the "world doesn't need a new crisis".
Beijing has been ramping up military drills in the strategically crucial Taiwan Strait, while the Chinese coast guard has been accused of harassing Filipino fishing boats in disputed waters.
Australia criticised Beijing last month for its "unsafe and unprofessional" conduct at sea, saying one of its navy divers was injured by sonar pulses from an approaching Chinese warship.
French Foreign Minister Catherine Colonna, speaking at the Australian Press Club in Canberra, said China should play its part to reduce tensions in the Asia-Pacific region.
"We are of course concerned by what happened a few days ago to the Australian navy, as well as what happened to the Philippines a few weeks ago," she said.
"Calm and stability must prevail in the Taiwan Strait, and certainly the world doesn't need a new crisis," she added.
Colonna stressed China should be free to pursue its "economic rise", but that in exchange it needed to meet international expectations on issues such as human rights.
"For all these reasons we will keep engaging China constructively, and there are actually encouraging signs," she said.
"Our efforts are paying off somehow and creating positive trends of cooperation."
Beijing claims most of the South China Sea, including waters and islands close to the shores of its neighbours.
The Philippines, Brunei, Malaysia, Taiwan and Vietnam have also staked claims to various islands and reefs in the sea, which is believed to contain rich petroleum reserves.
Belarus leader hails 'reliable' friendship with China
Belarusian President Alexander Lukashenko hailed his country's "reliable" friendship with China on Monday as he held talks with counterpart Xi Jinping on his second trip to Beijing this year.
Lukashenko, a staunch ally of Russia, arrived in China on Sunday for a visit expected to last at least two days.
He and Xi will discuss issues including "trade, the economy, investment and international cooperation", his office announced on Sunday.
Lukashenko last came to China in February, a trip that drew scrutiny given Moscow's invasion of Ukraine.
"Belarus is, was and will be a reliable partner for China," Lukashenko told Xi on Monday, according to a readout of the talks from the office of the Belarusian presidency.
"We decided long ago that we would cooperate... and be friends with China," he said.
"This friendship is more than 30 years old and has never turned away from this path."
Beijing has not publicly condemned Russia's offensive despite pressure from the United States and other Western nations.
Belarus relies heavily on Russia for political and financial support, and was used as a launchpad for Moscow's assault against Ukraine in February 2022.