Any facts or verification that this was actually done by Ukraine? Seems like it’d be pretty on point for Russian propaganda to throw a few drones at themselves to whip up fervor. Not to mention the fact that it could’ve been done by partisans in Russia itself. I’d label either of those more likely than Ukrainian attacks on civilian infrastructure.
The West insisted that their weapons are not to be used inside Russia. I don't think Ukraine would want to risk the supply of weapons for small political gains.