UFO footage shows pilots chased by circular object

A workman in the United States claims his hazy video footage shows a plane being chased by a UFO in the skies over Astoria, New York.

The mysterious object is described as a circular craft which suddenly makes a spontaneous 90 degree turn, next to what looks like, a conventional aircraft.

The majority of UFO sightings are often explained as natural phenomenon or man-made objects like drones or experimental aircraft.

What do you think the video shows?