Bildunterschrift:The United Nations Special Envoy of for Yemen Ismail Ould Cheikh Ahmed (C) sits with Yemeni rebels' during Yemen peaces talks on June 16, 2015 in Geneva. Iran-backed Yemeni rebels accused Saudi Arabia of trying to sabotage UN peace talks in Geneva and ruled out negotiations with the exiled government saying it lacked legitimacy. AFP PHOTO / FABRICE COFFRINI (Photo credit should read FABRICE COFFRINI/AFP/Getty Images)