South Korea's ousted premier said Thursday that he had opposed suspended President Yoon Suk Yeol's declaration of martial law, testifying for the first time at his former boss's impeachment trial about the events of a night that threw the country into turmoil.

Impeached president appears in two courtrooms, first to hear criminal insurrection charges and then to face a Constitutional Court impeachment trial, both in connection with his Dec. 3 imposition of m