US Speaker Nancy Pelosi has met Taiwan President Tsai Ing-wen in a visit that has been strongly condemned by China.
Ms Pelosi, the most senior US politician in 25 years to visit Taiwan, said her delegation had come to make it “unequivocally clear” that the US would not “abandon” the island.
China had earlier said the US would “pay the price” for Ms Pelosi’s visit.
Taiwan is self-ruled, but China sees it as a breakaway province that will eventually unite with it.
“Forty three years ago, America made a promise to always stand with Taiwan… today our delegation came to Taiwan to make it unequivocally clear we will not abandon our commitment to Taiwan,” Ms Pelosi said, referring to the Taiwan Relations Act.
Taiwan has become yet another flashpoint amid heightened tensions and sharp rhetoric between Washington and Beijing in recent years, with the US walking a diplomatic tightrope on the issue.
The US abides by the “One China” policy – a cornerstone of the two countries’ diplomatic relationship which recognises only one Chinese government – and has formal ties with Beijing and not Taiwan. But it also maintains a “robust unofficial” relationship with the island. That includes selling weapons for Taiwan to defend itself.
Ms Pelosi’s visit is viewed by Beijing as yet another sign of support for Taiwan.
However, the White House has been open opposed the visit, and President Joe Biden said the military assessed it as “not a good idea”.