Unfortunately, warfare has been part of the human experience for centuries and even millennia. Historically, wars were fought on the ground between individuals. Often, in more recent times, mass physical destruction has been caused from a distance, with bombs dropping from planes and missiles launched from remote locations.
And now, in the Internet age, wars can be waged electronically by purposely disrupting mission-critical systems of a perceived enemy state. Damages caused by such disruptions could be quite high, but there are potential international mechanisms by which such damages could be awarded.