Bola Tinubu takes oath as Nigeria's president amidst challenges.

Bola Tinubu has been inaugurated as Nigeria's new president, taking over from outgoing President Muhammadu Buhari. Tinubu faces the challenge of improving the country's economy and security, with unemployment soaring and financial insecurity spreading. He has promised to boost oil revenues and attract investment, but takes over under the cloud of a disputed election victory, with the result being challenged in court.