US President Joe Biden has again said the US would defend Taiwan in the event of an attack by China.

Asked in a CBS interview if US troops would defend the island, Mr Biden said: "Yes, if in fact, there was an unprecedented attack".

The remarks prompted the White House to clarify that US policy had not changed.

Taiwan is a self-ruled island off the coast of eastern China that Beijing claims as part of its territory.

Washington has always walked a diplomatic tightrope over the issue.