Are they? I dunno. I think two of the SFS 'planes effectively did touch-and-go landings. What kind of message is that supposed to be sending (apart from pilot skillz)?
The suggestion I’ve seen is that it’s an annual check of the ability to disperse the Russian government during a nuclear crisis, so once the aircraft arrive at destination, job done, back to Moscow. If so, the timing of such an exercise would be the message.
Problem is, these are the kind of movements you might expect to see* if things were indeed about to kick off.
(*or not see. The fact that it was all trackable on FR24 suggests that a message was being sent)
edit: what @Stonehedge said