It could be that the attack on the supposed ammo depot previously in Oktyabr'skii, Belgorod might also be done in this manner.I dont know why its strategic. when satellites can see where the airdefense systems located and they planned for gaps inside.
The fact that could not use missile or MLRS but need to send choppers for oil storage show more desperation.
Whatever missile Ukraine has right now, won't have enough accuracy to hit both of these targets from a safe enough distance away.