Yes, that's good thinking and almost certainly correct . Pushing their glide bombers back is a part disablement of their function.Given the west's previous reluctance to do anything that could be construed as escalation, could it be that we are giving the Russians 'fair warning' to move their planes to a place of safety, i.e. a safe distance beyond the range of ATACMS? Presumably, if the planes are used again to bomb Ukraine, they will be considered to be a valid target.
Perhaps the reported arrival of missiles from Iran, could have prompted the visit by Anthony Blinken and David Lammy and the pre-announcement.
I imagine the west knows pretty well how the Iranian missiles are transported to Russia. If by ship... probably out of range of Ukrainian drones?? for now.