Which country besides the United States kept extensive official records of UFO sightings?

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Declassified U.S. military video of unidentified aerial phenomena (UAP) — unidentified flying object Learn about an unidentified aerial phenomena (UAP) sighting from this video (known as the Gimbal video) captured by fighter pilots associated with the USS Theodore Roosevelt carrier strike group. The video shows instrument detections of unknown aerial objects, which the pilots were unable to identify, off the East Coast of the United States, 2014–15.

Aside from the United States, Canada is the only country that maintained official and relatively complete records of unidentified flying object sightings. These records, which documented approximately 750 sightings, were transferred in 1968 from the Canadian Department of National Defense to the Canadian National Research Council.1

While other nations such as the United Kingdom, Sweden, Denmark, Australia, and Greece have also maintained records of UFO sightings, these collections are considered less complete than those kept by the Canadian government.1