The Democratic Republic of Congo’s electoral commission declared opposition leader Félix Tshisekedi as the winner of the Dec. 30 presidential election, a stunning announcement that contradicts an unofficial tally by the largest observer mission and throws the Central African nation into uncharted territory.
It is the first time since independence from Belgium that an opposition candidate would take the presidency of the resource-rich country after an election. The 55-year-old Mr. Tshisekedi is set to succeed President Joseph...