At first, it seemed that President Joe Biden had misstated policy when he said the United States would defend Taiwan from aggression by China. The White House promptly walked back his remarks, and the potentially explosive gaffe appeared to have been resolved.
Then he repeated it, and the White House "clarified" again. And then he did it yet again, and again.
At some point, we would have to forgive Beijing for taking Biden at his word, especially when his ad hoc pronouncements are backed up by efforts to supply Taiwan with enough weapons to hold out against an invasion until help arrives.