Ugandan diplomat Olara Otunnu has joined the contest to become the next secretary-general of the United Nations, the seventh contender to succeed Antonio Guterres when he steps down at the end of this year. Otunnu, a former UN under-secretary-general who served as a special representative for children and armed conflict, was nominated by Uganda in a letter on Friday to the presidents of the UN General Assembly and Security Council. At 75, he is the oldest of the current candidates for the role, which Guterres has held for two five-year terms.

The race to become the next leader of the United Nations added a seventh candidate: Uganda's Olara Otunnu, a former opposition presidential candidate and onetime high-ranking UN…

The race to become the next leader of the United Nations on July 25 added a seventh candidate: Uganda’s Olara Otunnu, a former opposition presidential candidate and onetime…