Yonhap news agency says South Korean prosecutors have indicted the impeached President Yoon Suk Yeol over his imposition of martial law.

South Korean President Yoon Suk Yeol attended on Tuesday a Constitutional Court hearing of his impeachment trial where the detained leader may get a chance to argue his case or answer questions over his short-lived bid to impose martial law.

South Korean President Yoon Suk Yeol denied wrongdoing as he branded himself as a firm believer in democracy in his first appearance at an impeachment trial looking into his shocking and brief imposition of martial law last month.