Ukraine has been all but confirming their continued drone attacks against Moscow for months now. They don’t bring any/big body counts normally, but it’s still a deliberate attack on civilians and infrastructure. Ie a war crime.
Calling out Russia for targeting civilians and infrastructure is correct. That’s why Putin has an ICC arrest warrant active, for ordering war crimes. If this attack is indeed Ukraine’s doing its a big problem, nor a good strategic use of Ukraine’s limited military resources.