Footage reportedly shows a Ukrainian quadcopter drone dropping a modified grenade directly onto the engine compartment of a Russian T-80 tank. The video ends immediately, which tells us that there was no catastrophic cook off. However, the grenade is designed with a shaped charge intended to cut through steel armor, which may have caused mechanical damage to the engine below. It's also possible that the tank only sustained superficial damage. No accurate damage assessment can be determined from this footage alone, beyond the fact that a direct hit was made.