This is not a surprising development, given the modern war-lab that is Ukraine, but super interesting for sure!
The video implies that the fragmentation occurs while still in the barrel (no suppressors or comps can be used, etc.), so the bullet has some sort of protective cover (as shown) to allow for regular magazine fed operation, etc. - would be great to know more about how this is actually constructed.
Thanks for posting this! - even though you have no interest in, nor ownership of, military firearms of any kind, whatsoever...
P.S. With 7.62mm you get extra egg roll (fragmentation) with your order...showing size matters once again!