Where are they when we need them?
After the last few years I wouldnt be in the slightest bit surprised if its either:
a) friendly aliens coming to say hello and we keep killing them to the point they will decide we're a bunch of bastards and eradicate us.
b) China and or Russia being baddies which will lead to full on WW3.
c) an over reporting diversion tactic to steer attention away from something else (the dead cat theory) (I hate that term as I love cats).
The first one, being identified as a large floating balloon type object I just put down to a Sam Smith sighting, but now I'm not sure.