A senior Biden administration official said on Thursday that U.S. policy on Taiwan had not changed after President Joe Biden appeared to suggest the United States would defend the island if it were attacked, a deviation from a long-held U.S. position of 'strategic ambiguity.' In a interview aired by ABC News on Thursday, Biden was asked about the effects of the chaotic U.S. withdrawal from Afghanistan and responses in Chinese media telling Taiwan this showed Washington could not be relied on to come to its defense. Biden replied that Taiwan, South Korea and NATO were fundamentally different situations to Afghanistan...