Seen the Poseidons do similar at times - though they usually don't show up properly on ADSB and/or turn off transponder once in the mission area.
Last time I saw them doing that with AWACS on station from what I could gather, though an assumption on my part, NATO was moving nukes out of Germany for some reason under heavy escort.
EDIT: Russian strategic bomber net has been very active last couple of hours - possibly they've been doing patrol flights into NATO air space in the region. (Though I've seen no QRA activation but not really been looking for it).
Its obviously an intentional act having it visible as with all the others patrolling along the borders. Just not seen that particular area being patrolled in a visible way before. Thanks for the possible explanation
