Mi-24 or Mi-35 helicopter being struck by a missile

What happens in this video ?

Mi-24 or Mi-35 helicopter being struck by a MANPADS missile, near Kiev, Ukraine. All the helicopter crew was killed. The video is undated, but has been released on March 5th 2022.
Man-portable air-defense systems (MANPADS) are light portable surface-to-air missiles. They are guided weapons and are a threat to low-flying aircraft, especially helicopters.