Fair point. Presumably the Russians have an ADIZ, making the RJ fair game for any tracking action, including defensive SAM's, until it is identified and intentions are known. It's not unknown for US warships to do the same in international waters. If it was a real attack threat, you'd probably look a bit silly if you didn't have your defence systems locked on and ready to go, just in case you upset someone who is there to probe your defences.