The visit made by some United States politicians to Taiwan is another example of the US violating its solemn stance on the Taiwan question and deliberately undermining peace and stability in the Taiwan Straits, a Chinese mainland spokesman said on Monday after a delegation of US lawmakers arrived on the island on Sunday.

"The erroneous act seriously violated the one-China principle and the provisions of the three Sino-US joint communiques, and we firmly oppose it," said Ma Xiaoguang, a spokesman for the Taiwan Affairs Office of the State Council.

Ma made the remarks as a five-member US congressional delegation, led by Democratic Senator Ed Markey of Massachusetts, is visiting Taiwan 12 days after a visit by US House Speaker Nancy Pelosi, despite strong opposition from Beijing.

Some politicians in the US have not learned from the serious consequences that followed Pelosi's visit to Taiwan, whose Democratic Progressive Party authorities have been colluding with external anti-China forces to seek "independence", Ma said.

"It fully exposes the sinister intentions of the US in using Taiwan to contain the mainland, and the DPP authorities in relying on the US to seek 'independence'," he said.

"Our struggle to safeguard national sovereignty and territorial integrity has won wide support from the international community," he said.

Ma warned the DPP authorities that there will be more severe measures taken if they continue such actions.