Well, they say it has official US markings. I am still waiting for the photo.Russia being more formidable we might see things tested closer to a real war environment. Maybe why an older platform was used. Interesting to see if more advanced technology testing the waters.
If they produce a real photo, the US will announce oif they have one missing. It could also be one of the other EU users of the particular UAV.
We will just have to wait and see.
IMHO, if the US was going to do it and try and get it done without notice, they would be using a much newer technology bird, that is much more stealthy. If they were just testing the waters, they would use an older bird like this.
However, there is no confirmation as of yet, either by photograph or the US military that this actually happened. I expect if Russian forces have it, photos will follow in fairly short order.