The following video shows an impressive display of lights dancing over a city in Chile. What’s more, the video offers a reference or comparison point when the person filming these lights manages to stand behind a giant building crane.
We can then only appreciate the rough distance and size of the lights in the night sky. The lights split off in groups of three or four before flying off into the distance.
It looks impressive and they are definitely not military flares or Chinese lanterns. So that leaves us with either R/C aircraft or military aircraft. From the video we can guess that the size of those orbs of light is way larger than any R/C aircraft can produce or carry off in such a distance.
My guess would be that these UFO lights are just military choppers practicing night time drills.