The Chinese mainland conducted a series of aircraft exercises in the southwest airspace of the island of Taiwan on Saturday and Sunday, sending 13 and 15 fighter jets respectively in the two days, many of which were main combat aircrafts of the People's Liberation Army (PLA). The Taiwan authorities are feeling the pressure, and the US State Department had issued a statement, urging the Chinese mainland to "cease pressure against" the island while reaffirming its commitment to the island. However, the juxtaposition of the three China-US joint communiqués, the Taiwan Relations Act and the six assurances mentioned in the US statement this time differs from the Trump administration's refusal to mention the three joint communiqués in his later period.