The Supreme Court on Thursday upheld a seven-year prison term for former President Yoon Suk Yeol for obstructing justice by blocking investigators from detaining him in the wake of his failed martial law bid in 2024.

South Korea’s Supreme Court has upheld a seven-year prison sentence for former President Yoon Suk Yeol in the first case to reach the country’s highest court from the several criminal trials related to his brief imposition of martial law in...