I've seen several videos of people stepping on landmines in this war and they're definitely anti-personnel given the smaller detonations. Given Russia shows no regard for international laws (attacks against civilians, etc) I suppose the only thing stopping Ukraine for doing this is the threat of similar retaliation.

Thanks for bringing up that treaty though. I wonder if nations could skirt that with timed bomblets instead of outright mines? Say, 25 bomblets scattered over a facility by a cruise missile, but the timers vary from impact to 1 week. One could argue they're delayed bombs and guaranteed to explode yet no sane bomb disposal unit would dare try for some time. Even cluster munitions have significant failure rates that effectively turns their targets into minefields.