Mr. Biden had ignored the practiced imprecision of his predecessors with regard to China and Taiwan before in his presidency. Last August, in reassuring allies after his decision to abandon the government of Afghanistan, he promised that “we would respond” if there was an attack against a fellow member of NATO and then added, “same with Japan, same with South Korea, same with Taiwan.”
Taiwan, however, has never been granted the same U.S. security guarantees as Japan, South Korea or…