In his address to the 10th anniversary commemoration at Potočari, the UN Secretary-General paid tribute to the victims of "a terrible crime – the worst on European soil since the Second World War", on a date "marked as a grim reminder of man's inhumanity to man". He said that the first duty of the international community was to uncover and confront the full truth about what happened, a hard truth for those who serve the United Nations, because great nations failed to respond adequately. There should have been stronger military forces in place, and a stronger will to use them.