Now to combat some of the speculation from that video. If it is flares, why don't we see a plane on top that is dropping them flares? Too far to see and your camera phone is too ancient technology for the zoom in.
Well if there is a plane nearby, wouldn't it show on the radar?
Well aren't they in a hostel area the china sea? If you gonna conduct a test drill, would you want the world to know what you are doing? So I think they turned off their transponder on purpose so the radar can not pick them up.
Well if you see an object flying over there, why don't you fly closer for a look? Well these guys who filming sounds like a passenger airline so if you go off course without letting the tower knows about it, they will say that your plane got hijack or worse yet, you are entering a no fly zone so china military will shoot your azz down.