Beijing has raged at the trip by Pelosi -- the highest-ranking elected US official to visit Taiwan in decades -- ripping up a series of talks and cooperation agreements with Washington, most notably on climate change and defence.

It has also deployed fighter jets, warships and ballistic missiles in what analysts have described as practice for a blockade and ultimate invasion of the self-ruled democratic island that China claims as its territory.

Those drills had been expected to draw to a close on Sunday, but China said Monday they were still ongoing.

"The eastern theatre of the Chinese People's Liberation Army continued to carry out practical joint exercises and training in the sea and airspace around Taiwan island," the military said.

The exercises, the PLA's Eastern Command said, were "focusing on organising joint anti-submarine and sea assault operations".

Taipei condemned Beijing for extending the drills.

"China's provocation and aggression have harmed the status quo of the Taiwan Strait and raised tensions in the region," the island's foreign ministry said in a statement.

Beijing was also set to carry out live-fire drills on Monday in parts of the South China Sea and the Yellow Sea.

- Taipei defiant -

Taiwan has remained defiant throughout the Chinese drills.

Its military said it would hold anti-landing exercises in Taiwan's south on Tuesday and Thursday.

"We will practise counter moves against simulated enemy attacks on Taiwan," Lou Woei-jye, spokesman for the Eighth Army Corps, told AFP.

They will include the deployment of hundreds of troops and about 40 howitzer guns, the military said.

Taiwan has insisted that no Chinese planes or ships have entered Taiwan's territorial waters during the drills.

But to show how close it came to Taiwan's shores, the Chinese military released a video of an air force pilot filming the island's coastline and mountains from his cockpit.

The Eastern Command also shared a photo it said was of a warship on patrol with Taiwan's shoreline visible in the background.

Ballistic missiles were fired over Taiwan's capital during the exercises last week, according to Chinese state media.

The scale and intensity of China's drills -- as well as its withdrawal from key talks on climate and defence -- have triggered outrage in the United States and other democracies.

US Secretary of State Antony Blinken has said Washington is "determined to act responsibly" to avoid a major global crisis.

- 'Issuing a warning' -

But Beijing on Monday defended its behaviour as "firm, forceful and appropriate" to American provocation.

"(We) are only issuing a warning to the perpetrators," foreign ministry spokesman Wang Wenbin told a regular briefing, promising China would "firmly smash the Taiwan authorities' illusion of gaining independence through the US".

"We urge the US to do some earnest reflection, and immediately correct its mistakes."

Experts say the drills have revealed an increasingly emboldened Chinese military capable of carrying out a gruelling blockade of the island and obstructing US forces from coming to Taiwan's aid.

"In some areas, the PLA might even surpass US capabilities," Grant Newsham, a researcher at the Japan Forum for Strategic Studies and a former US Navy officer, told AFP.

"If the battle is confined to the area right around Taiwan, today's Chinese navy is a dangerous opponent -- and if the Americans and Japanese do not intervene for some reason, things would be difficult for Taiwan."