The U.S. U-2 high-altitude reconnaissance aircraft intruded into the no-fly zone of the PLA’s northern combat zone without authorization, seriously interfering with the Chinese side’s normal exercise and training activities, seriously violating the China-U.S. code of conduct for maritime and air safety and relevant international practices, and easily causing misunderstandings and misjudgments or even maritime and air accidents, which is a nakedly provocative action. China demands that the United States side immediately stop such provocative actions and take practical action to maintain peace and stability in the region.