While Russia is committing war crimes, they have not used cluster bombs. AFAIK this claim is based on a report that they were deploying cluster bombs against a civilian mall in Kharkiv. The video shows rapid explosions falling on the mall, but not as rapidly as one would expect to see if cluster bombs were used. Most likely it was Grad (MRLS) missiles. Still likely to be a war crime, but not cluster bombs.
Your comment inspired me to search harder, and I found what I believe to be credible evidence that some of the MRLS missiles targeted at Kharkiv contained cluster munitions. I would retract my above comment.
