Russian ammo dump destruction by ATACMS!
Oh. Oops.
Mariupol had a really large ammunition dump and apparently it was significantly used and apparently Russian forces can't cover up such Soviet tactics as well as there is no way that the extremely delicate Soviet supply network is going to be able to survive changing anything this late into the game. So of course it lends itself directly to Ukrainian forces being able to directly hit and Target these.
So congratulations to the Ukrainian military forces for a very well done job.