“It’s far cheaper to deactivate them (cluster munitions) in Russia.”
...and thereby deactivate some of the threat that drives the requirement for those munitions as well - added bang for the buck.
Can’t afford to not fire them on Russian targets now, while it is a permissive environment.
I saw earlier reports that the Ukraine Army is being especially clever in using these cluster munitions. There are a number of little bomblets packed in a large shell. The Ukrainians are removing these little fragmentation bombs from the large metal shells, and then delivering individual bomblets with small drones to drop them into trenches, buildings where Russians have been seen to enter or stay, etc.