Kenya is often held up as a beacon of democracy in Africa, but as the latest election showed, it is not always pretty. Disputes started even before a winner was named.

The last unit of the French military mission, Operation Barkhane, crossed into neighboring Niger, from where France will run its counterterrorism efforts in the region.

Mr. Ruto grew up poor, tending his family’s livestock in a remote village. As a presidential candidate, he appealed to the “hustler nation” of disenfranchised strivers, saying he was once like them.