NEO,
As I remember it was a "flock" of MI-35's that flew in to refuel in Osubi and one took a shortcut from the taxiway to the ramp in Osubi, got stuck with a wheel in the storm drain and when trying to get out managed to roll the aircraft?
212man will be able to correct me if I'm wrong, he was around at that time as well.
Cheers,
Finalchecksplease