President Vladimir Putin said Russia had a “sufficient stockpile” of cluster bombs and reserved the right to use them if such munitions, the use of which he said he regarded as a crime, were deployed against Russian forces in Ukraine.
Ukraine said on Thursday it had received cluster bombs from the United States
From what I understand Putin is using a stricter definition of “cluster bombs” as a muntition containing a bomblets submunition.
I have seen of Russian videos munitions are hypersonic missiles, thermobaric bombs (incendiary submunition), and timed remote mine submunitions (a timed self-destruct feature or one that turns it inert after a while) but none utilizing a pressure fuse like the butterfly mines that were used by Ukraine.
They are terrible weapons regardless of definition
Both sides claim the other is using these, and both sides likely are.