Ukraine has used drones to attack numerous targets as far, and more, for two years now. I think the record was something over 1000km. There have been numerous attacks in and around Moscow.
That was why, for instance, Ukraine has been able to cause significant damage to cracking towers on dozens of oil refineries. Those are sensitive small targets where a small warhead can be effective.
Ukraine has also used drones to attack distant airfields, fuel depots, ammo dumps, etc. The only important difference in this case was that the ammo was supposedly in bunkers. That would make it proof vs a small warhead.
The problem with drones has been small warheads due to limited availability of high energy power plants for drones. Lately Ukraine has been showing off jet powered drones. Maybe this is a first use of these.