Nothing really makes sense to me here unless it was intentional or a false flag operation. If it was the rebels by mistake it will eventually come out, if it was the Ukrainian military by mistake it will probably also come out, and if it was the Russians shooting over the border it will certainly come out. I mean if it was an accident - whoever to blame - the only rational thing would be to come straight and apology! It has happen before and unfortunately it can happen again.
I don’t get it
Just hope a proper investigation can get started.