When the media calls it "intervention" this has a negative implication, but in fact the US believes peace and security across the Taiwan Strait is an international issue, not merely a Chinese internal affair, so the question of intervention doesn't apply.
媒體說「介入」，有負面的意思，其實美國認為台灣海峽的和平與安全是國際間的問題，不僅僅是中國內部的事務，所以沒有介入不介入的問題。