That looks like a lenticular cloud. They are strange and beautiful, but they are a natural formation that is often reported as a ufo. I was waiting for something to appear out of it, but nothing happened.
It would be helpful if you gave some information about videos when posting them and a short translation/summary of the article if it's not in English. Even google translate would work.
As herondancer wrote it is a cloud and funnily most often they are indeed named "UFO-clouds", cause of their look. On the strange skies category on sott you can follow many different phenomenon that appear on our skies.
Here is a most recent from last month over Mt. Rainier:
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