Hadn't seen this one posted elsewhere, this is the first time I've seen it. I'm guessing the UFO was added digitally over a real video but they did a decent job of it for a close-up perspective.
Source: https://www.reddit.com/r/ufo/comments/ogl9p3/ufo_filmed_from_a_helicopter_in_kamchatka_russia/
Source: https://www.reddit.com/r/ufo/comments/ogl9p3/ufo_filmed_from_a_helicopter_in_kamchatka_russia/