The People's Liberation Army's Eastern Theatre Command said a naval fleet had taken part in a training to assess its collaborative combat capabilities.
The military did not say exactly when or where the drills took place, or which specific units took part.
The exercises included joint anti-submarine operations, joint search and rescue and damage control, it said in a statement.
They "effectively tested and enhanced the fleet's readiness in actual combat capabilities," the statement said.
Footage released by the theatre command showed Chinese sailors on grey warships rushing to battle stations as alarm bells sounded.
It then showed gun batteries on the ships' decks swivelling and firing shells and missiles into the air in plumes of flame and smoke.
China claims sovereignty over a sweep of disputed islands, reefs and waters in the East and South China seas.
It has ramped up pressure on regional rivals in recent months in what analysts say is a concerted effort to force their compliance.
Beijing claims the self-ruled island of Taiwan, islands in the East China Sea also claimed by Japan, and almost the entire South China Sea -- notably clashing with Philippine and Vietnamese fishers and sailors in the last few months.
World leaders have discussed the territorial disputes at a summit in Laos this week.
US Secretary of State Antony Blinken said Friday that Washington was "concerned about China's increasingly dangerous and unlawful actions on the South and East China Seas".
Clashes on South China Sea, Ukraine dominate Asia summit
Vientiane (AFP) Oct 11, 2024 -
The United States and its allies clashed on Friday with Russia and China at a summit in Laos dominated by disputes on maritime claims and Ukraine.
World leaders descended on the normally tranquil, temple-lined streets of the Laotian capital Vientiane, which marked a rare occasion bringing together the top US and Russian diplomats.
The East Asia Summit came on the heels of meetings of the ASEAN bloc, where the Philippines has led the charge in criticising Beijing's actions in the hotly disputed South China Sea.
US Secretary of State Antony Blinken, meeting ASEAN leaders before the full summit, reiterated calls for freedom of navigation in the bustling waterway.
"We remain concerned about China's increasingly dangerous and unlawful actions on the South and East China Seas, which have injured people, harmed vessels from ASEAN nations and contradict commitments to peaceful resolution of disputes," Blinken said.
China has deployed military and coast guard vessels in recent months in a bid to eject the Philippines from a trio of strategically important reefs and islands in the South China Sea.
It has also been ratcheting up pressure over a disputed island group controlled by Japan in the East China Sea, rattling Tokyo and its allies.
Blinken also warned China over Taiwan, where the new leader delivered an annual speech in which he vowed that the self-governing democracy would resist annexation.
"China should not use it in any fashion as a pretext for provocative actions," Blinken told reporters.
- US, Russia hostility -
Despite disagreements, tensions over the past year have markedly eased between China and the United States, with President Joe Biden supporting dialogue to reduce the potential for conflict.
Biden and his political heir Vice President Kamala Harris, who both skipped the summit ahead of elections, have taken a different approach to Russia, believing Moscow's diplomatic overtures are insincere.
Blinken and Russian Foreign Minister Sergei Lavrov were spaced apart by the leaders of South Korea and India at the summit. Blinken said he did not speak to Lavrov but that neither walked out when the other addressed the summit.
"I think it's safe to say that we heard each other. I didn't hear anything new, unfortunately, about the ongoing Russian aggression against Ukraine," Blinken said.
Lavrov told reporters that the United States was "destructive" in Asia.
He also attacked the "militarisation" of Japan, where security-minded new Prime Minister Shigeru Ishiba has in the past called for a NATO-style Asian pact with an unstated goal of deterring China.
"The Japanese are obviously being pushed to such a course by the United States," Lavrov charged.
Japan's foreign ministry said that Ishiba, on his first foreign trip since taking over, reiterated "serious concerns" about the "intensification of Chinese military activities in areas surrounding Japan" in a meeting with Premier Li Qiang.
Li made a veiled swipe at Ishiba during an ASEAN-related meeting on Thursday, warning of the danger of "attempts to introduce bloc confrontation and geopolitical conflicts into Asia".
In an interview with AFP at the summit, EU chief Charles Michel called for disputes to be resolved "through peaceful means" in the South China Sea.
The wide differences between the big players on international issues -- especially the Middle East crisis -- meant it was not possible for the leaders to agree a joint summit statement, an Asian diplomat said.
- Push for Myanmar diplomacy -
The summit saw participation for the first time in more than three years by military-run Myanmar, which has brushed aside a 2021 ASEAN plan after its coup that calls for dialogue and an immediate end to violence.
ASEAN leaders in a statement voiced "deep concern" over Myanmar's path and stood by the plan, known as the Five-Point Consensus.
The United States, while supporting ASEAN diplomacy, has urged no let-up in pressure against the junta until it shows signs of progress.
Indian Prime Minister Narendra Modi, who has engaged the junta in the neighbouring country, voiced support for the restoration of democracy but said: "We believe that Myanmar should be engaged rather than isolated in this process."
Modi, who was seen speaking warmly with Blinken, has annoyed Washington by refusing to back Western sanctions on Russia, India's Cold War partner.
India, by contrast, has a border dispute with China and Modi at the summit voiced firm support for open navigation in the South China Sea.
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