Taiwanese President Lai Ching-te, detested by Beijing, vowed on Tuesday "to prepare for war to avoid war" and bolster the island's economic resilience.

That morning, China sent several "armoured vehicles" into waters off southern Fujian, the eastern Chinese province closest to Taiwan, CCTV said.

Footage of the drills released by the broadcaster's military outlet showed several camouflage-patterned tanks pushing off a sandy bank into the ocean.

Soldiers in orange life vests drove the tanks around floating obstacles, the roughly minute-long montage showed, backed by an operatic instrumental score.

"Soldier is our identity, training is our daily routine," said one member of the Chinese brigade, adding: "We are always ready to fight."

Sets of high-rises could be seen in the background of at least two frames.

China, which claims self-ruled Taiwan is part of its territory and has threatened to use force to annex it, has held several rounds of large-scale military drills around the island since Lai took office.

Taiwan's defence ministry said Tuesday it had detected six aircraft and eight vessels of the People's Liberation Army operating around the island.

Marking the anniversary, Beijing's Taiwan Affairs Office also slammed Lai's "separatist position" that promoted "economic decoupling" across the Taiwan Strait.

Beijing was "willing to engage in dialogue" with Taipei but on condition that it accepts "the one-China principle", spokesperson Chen Binhua said, referring to its policy that states Taiwan is part of China.

Taiwan's Lai said Tuesday there was room for communication with Beijing if there was "parity and dignity".