Nato’s accidental bombing of refugees in Kosovo and the horrific images it produced shocked the world. Belgrade said more than 70 Kosovo Albanians were killed in the Nato attacks, in mid-April. After several days of confusion, Nato admitted its warplanes may have caused civilian casualties. The picture of a distraught boy in a yellow jumper slumped amid the carnage told the story of the tragedy on many of the world’s front pages.