Seoul court acquits Yoon Suk Yeol in the marine death ambassador case

The Seoul Central District Court on 11 September acquitted former President Yoon Suk Yeol of charges that he named former Defence Minister Lee Jong-sup ambassador to Australia in order to pull him out of a criminal investigation. Special counsel Lee Myeong-hyeon's team had asked for a five-year prison term. The court also cleared five other former officials, including former National Security Adviser Cho Tae-yong and former Justice Minister Park Sung-jae.

The case grew out of the death of Corporal Chae Su-geun, a Marine who drowned in July 2023 during a flood rescue in Yecheon, about 160 kilometres south-east of Seoul. Investigators later alleged a cover-up inside the Marine inquiry. Lee Jong-sup was a central suspect in that file when Yoon appointed him ambassador in November 2023. Lee left for Australia in March 2024 and returned days later after public protest.

The court said Yoon's order to appoint Lee could not be shown, beyond reasonable doubt, to have been meant to obstruct the inquiry. It noted that Yoon learned of a travel ban on Lee only in March 2024, months after the posting was decided. Judges said there was room to treat the move as an ordinary personnel decision by a head of state, not a rash swap designed to get a suspect out of the country. Yoon has said he sent Lee to Canberra to deepen military ties with Australia.

Yoon's lawyers welcomed the verdict and asked prosecutors not to appeal. The special counsel did not say on Friday whether it would. For Yoon, the acquittal is a rare break in a stack of criminal cases that followed his short imposition of martial law and his later removal from office. Most of those files are still live. This one is not, unless the appeal courts reopen it.

The legal question was narrow. Korean law on abuse of authority and on helping a suspect flee requires proof of intent. A presidential appointment is, on its face, a constitutional act. To turn it into a crime the prosecution had to show that the purpose of the posting was evasion, not diplomacy. The court held that the timeline undercut that claim. If Yoon did not know about the travel ban when he made the choice, the intent element failed.

That holding will be read next to the remaining cases, which rest on different facts: the martial law decree itself, election-law counts, and other alleged abuses. An acquittal on one theory of obstruction does not speak to those files. It does tell future special counsels that a personnel order, standing alone, is a weak vehicle for a criminal charge against a president unless the paper trail shows he knew the legal risk and chose the posting anyway.

Lee Jong-sup's own exposure in the Marine case is separate. The acquittal of the president and the five aides does not decide whether the original inquiry into Chae's death was honest. Families of the Marine and opposition politicians will keep pressing that point. The court on Friday was not asked to retry the flood operation. It was asked whether a November 2023 ambassadorial appointment was a crime. It said no.

What follows is procedural. Prosecutors have a window to appeal. If they do, the case moves up. If they do not, this file closes and Yoon's remaining trials continue without it. Either way, the political use of the verdict started within hours. His lawyers called it proof that at least one special-counsel theory was overcharged. His critics called it a technical escape that leaves the Marine's death unanswered.