Is This a UFO, or Just a Man-made Smoke Ring?

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The heightened interest in UFOs continue when a mysterious black ring appeared in the sky and was caught on video hovering above the village of Shorthandy in Kazakhstan.

Watch the video which sparked numerous UFO rumors and speculations on the said sighting. Some say that it was a UFO, based on similar sightings on different occasions in other countries.  Others presume that it was only man-made.