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I've seen reports of this being a large unmanned drone rather than an Su-25. Possibly one they had lost contact with.
My first thought was it was a pilot trying to defect. Only thing I wonder about is why he'd be flying that high. It's tough to make sense of this.
Here's another angle from a Reddit post. Some of the theories are discussed at length in the comments.
Also, damn, that missile got there in a hurry.