A test of China's HQ-9B defense system.
According to published reports, the Shenwei Missile Battalion of the People's Liberation Army Air Force of China tested the HQ-9B surface-to-air missile system earlier this week. This system is said to be designed to intercept ballistic missiles and other missiles.
In one of the published videos, the defense missile changes its direction in the middle of the path; An operation that was probably part of the interception test of a maneuverable ballistic missile.