U.N. Secretary-General Ban Ki-moon addresses a news conference at the United Nations European headquarters in Geneva in this May 11, 2011 file photo. Ban is planning to formally announce his candidacy for a second five-term as U.N. secretary-general early next week, U.N. diplomats said on June 4, 2011. The former South Korean foreign minister had already received assurances of support from the U.S.and other key members of the U.N. Security Council, diplomats said in March, making his re-election all but certain. REUTERS/Denis Balibouse/Files (SWITZERLAND – Tags: POLITICS HEADSHOT)