It is not difficult technically, but it is difficult politically. Those are 2 different things. Why you think no one else has done it? if its technically easy then why havent more countries done it?no offence, but downing a propeller driven straight wing plane with no EW measures, is not difficult. It is a political decision... Even chinese didn't shot down
https://en.wikipedia.org/wiki/Hainan_Island_incident
No.Does displaying the debris means that the drone entered Iranian airspace and hence it was not flying over the international airspace?