US House Speaker Nancy Pelosi said Wednesday her delegation had come to Taiwan in peace for the region, after the visit enraged Beijing and set off a diplomatic firestorm.

She landed in Taiwan late Tuesday, defying a string of increasingly stark warnings and threats from China, which views Taiwan as its territory and had warned it would consider her visit a major provocation.

Pelosi, second in line to the presidency, is the highest-profile elected US official to visit Taiwan in 25 years.

We come in friendship to Taiwan, we come in peace to the region, she said during a meeting with Tsai Chi-chang, the deputy speaker of Taiwans parliament.

As Pelosi -- who is on a tour of Asia -- touched down in a military aircraft after days of feverish speculation about her plans, the reaction from Beijing was swift.

US Ambassador Nicholas Burns was summoned by the Chinese foreign ministry late Tuesday and warned that Washington shall pay the price.

The move is extremely egregious in nature and the consequences are extremely serious, Chinas Vice Foreign Minister Xie Feng was quoted as saying by state news agency Xinhua.

China will not sit idly by.

The Chinese military said it was on high alert and would launch a series of targeted military actions in response to the visit.

It promptly announced plans for a series of military exercises in waters around the island to begin on Wednesday, including long-range live ammunition shooting in the Taiwan Strait.

Those who play with fire will perish by it, Beijings foreign ministry added.

Taiwans defense ministry said more than 21 Chinese military aircraft had flown on Tuesday into the islands air defense identification zone -- an area wider than its territorial airspace that overlaps with part of Chinas air defense zone.

China has vowed to seize self-ruled, democratic Taiwan one day, by force if necessary.

It tries to keep the island isolated on the world stage and opposes countries having official exchanges with Taipei.

In a call with US President Joe Biden last week, Chinese President Xi Jinping warned Washington against playing with fire on Taiwan.

While the Biden administration is understood to be opposed to Pelosis Taiwan stop, White House National Security Council spokesman John Kirby said she was entitled to go where she pleased.

The United States has said, however, that its policy was unchanged towards Taiwan.

This means support for its government while diplomatically recognizing Beijing over Taipei, and opposing a formal independence declaration by Taiwan or a forceful takeover by China.

It was reported earlier that several US warships were cruising in waters near Taiwan on Tuesday, US military officials said, amid Chinese anger over Pelosis controversial visit to the island Beijing claims as its territory.

As China announced it would hold live-fire military drills in the Taiwan Strait in response to Pelosis visit, the US Navys Seventh Fleet said the nuclear-powered aircraft carrier Ronald Reagan was operating in the Philippine Sea, south of Taiwan.