U.S House Speaker Nancy Pelosi lands in Taiwan on a visit that could significantly escalate tensions between the U.S. and China.
Beijing claims the self-ruled island as its own territory.
China has vowed to retaliate if Pelosi becomes the highest U.S. elected official to visit Taiwan in more than 25 years, but has given no details.
Speculation has centered on threatening military exercises and possible incursions by Chinese planes and ships into areas under Taiwanese control.
