Lakhdar Brahimi, who gave up Tuesday after trying unsuccessfully to mediate an end to Syria's civil war, has spent his career in the diplomatic trenches of the world's most intractable conflicts. The 80-year-old Algerian succeeded in cajoling President Bashar al-Assad's regime and its fractious opponents to two rounds of peace talks in Geneva this year but failed to halt the civil war, which has killed more than 150,000 people and displaced millions since March 2011. UN chief Ban Ki-moon an**unced the resignation in New York,with Brahimi standing beside him, saying it would be effective from May 31. \"I'm **t disappointed, because I did **t expect any result this first time,\" he said of the glacial pace of talks back in January, warning that there was ** \"magic wand.\" But in the months since the gulf between the two sides has grown even wider, with Syria scheduling a presidential election for June 3 despite Brahimi's warning that doing so would sound the death knell for the negotiations.