The first (NM) object I'd bet is CGI. Seems odd no one else saw/reported/photographed this object on a clear evening in an urban setting. I also think the reactions of the young man and his "mom" are stilted, not natural.
The second (Japan) looks very much like a slow motion video of a circular florescent bulb. I don't think the object is rotating, I think it an optical illusion caused by the flicker effect of florescent lighting. The flicker effect is even more pronounced on florescent bulbs at the end of their service life.