South Korean President Yoon Suk Yeol faces a string of legal battles as the suspended leader fights to save his political career – and avoid prison – following his brief imposition of martial law last year.

South Korea's ousted premier said on 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.