Just my uninformed opinion, but for me this was quite deliberate and very much in keeping with an increasingly desperate Russia. Use something big and obvious like a smoky old R-27 which has already seen use by both sides in the conflict and make sure you fire it at a safe distance from the RJ and just launch it in boresight mode so it can’t track. Knowing that all these Forte/RJ/ Global Hawk flights are quite probably providing real-time tactical targeting data to the Ukrainians with which to attack Russian ground assets must be a bitter pill to swallow.
In other news the allegations of the US being responsible for the Nordstream pipeline sabotage seem to be gathering steam, reports of US Seahawk radar tracks directly over the damage site prior to the incident and the Swedes being reticent about releasing their investigation findings are adding fuel to the fire.
Just a rumour