Just like what happened when American navy shot down the Iranian civil airliner.
Except the USN stepped up and took responsibility once it was clear what happened. Like the Ukraine shoot down, there was active shooting going down during the incident. The Vincennes was actively engaging Iranian Gun Boats during the missile shot. I have a couple friends who were on Vincennes and in CIC when the incident happened. Initially jubilant, having sank and destroyed multiple Iranian Gun Boats and shot down an Iranian "F-14", they were crushed when it became clear what happened and how badly a couple watch standers screwed up.
Fog of war sucks, and flying a passenger jet into an active combat zone is insanity. Still, Russia should step up and take responsibility, pay the families and hold appropriate people accountable.