Initial reports indicate that the site, previously protected by one of Russia’s densest air defense networks, suffered catastrophic damage.
Good chance Ukraine could hit the Kremlin if they wanted to. They have drones with the 500 mile range to pull it off, and Russian air defense has become a joke. The only thing that's been stopping them was US worries about actions like that causing escalation. Ukraine has had less and less reason to care what the US thinks of late.
A 150-200mm drone frame wouldn't have that kind of range in its battery, anyway. There are useful drones in the war that are even smaller than that.