Could the reference have been to a previous event? Recall the Sibir airliner inbound from Tel Aviv that was evidently brought down by a Ukrainian missile near The Crimea a year or two ago?
Certainly it could have been an earlier event. I am ashamed to admit I started evesdropping because these guys were sort of interesting and I have a boring Walter Mitty life.
Still, this conversation was right after the two Russian planes were brought down. I assumed they were referring to that.
Don't want to spread false rumors however. I heard a few snatches of conversation--not a whole conversation. I could be all wrong.