UFO orbs spotted flying over Kansai, Japan

Filmed some time in the last three months (according to YouTube, the only date given for the footage is 2010), this video shows a group of UFOs that appear to be flying in some sort of formation before they break off and fly in and out of a cloud bank. While you can’t see the objects in any detail, the fact that they change direction quite rapidly seems to indicate that they are flying under there own power versus being some sort of balloon like object floating passively. Additionally, because the objects zip in and out of the cloud bank at different directions and angles, I am inclined to think that these are not aircraft performing or practicing some sort of aerobatic display (the limited visibility in the cloud bank would make this sort of flying far too dangerous). Taking these factors into account this could be footage of an actual daytime UFO sighting. Do you think this video shows a group of UFOs or something else? Feel free to share your theories in the comments.