South Korea 2024 martial-law crisis and presidential impeachment

Yoon's martial-law order and the constitutional removal of a president

South Korea's constitutional order was tested when President Yoon Suk Yeol briefly imposed martial law on 3 December 2024 and sought to restrict political activity. Soldiers and police deployed around the National Assembly, but lawmakers convened and demanded an end to the decree. The president withdrew martial law within hours; the crisis nevertheless continued through impeachment, criminal investigation and a Constitutional Court decision removing him from office. The immediate danger was executive power concentration using emergency authority against other elected institutions. The subsequent response also showed the capacity of parliament, courts, journalists and citizens to resist an unconstitutional measure.

Late on 3 December 2024, Yoon announced emergency martial law in a televised address, claiming the need to confront hostile and anti-state forces. Troops moved toward parliament as legislators and protesters gathered. In the early hours of 4 December, the National Assembly voted to demand the decree's withdrawal; Yoon then rescinded the order. This was not a normal dispute over budget or cabinet appointments. It involved a president's attempt to deploy coercive power while restricting the functioning of elected representatives. The relevant standard was constitutional resilience: could ordinary legal institutions operate when military resources were directed toward stopping their work?

On 7 December 2024, an initial impeachment effort failed for lack of the required parliamentary participation. On 14 December, the National Assembly passed a second impeachment motion, suspending Yoon from presidential duties pending Constitutional Court review. On 16 December, the court began its consideration of the case, and on 27 December it held an initial preparatory hearing. Separate disputes arose over the authority of acting presidents and the appointment of justices. These procedural conflicts mattered because the independence and functioning of the constitutional court were essential to ending uncertainty lawfully rather than by street confrontation or military bargaining.

On 3 January 2025, the court conducted another preparatory session. On 14 January it opened formal hearings; Yoon did not attend the first session. On 15 January, investigators detained the suspended president, an unprecedented step in South Korean presidential history. The criminal investigation and the impeachment review had distinct legal purposes: prosecutors examined potential criminal offences, while the Constitutional Court assessed whether removal from office was warranted. On 25 February, the court reached the final stage of hearings. Yoon and his legal team challenged the process and argued that the emergency was justified; the opposing side cited interference with parliament and constitutional limits on martial law.

On 4 April 2025, the Constitutional Court unanimously upheld the impeachment and removed Yoon from office. The court's published English summary identified constitutional and statutory violations in the declaration and execution of martial law. The judgment required a new presidential election under the constitutional timetable and showed that the presidency was not immune to institutional review. Supporters of removal hailed the result; Yoon loyalists disputed the allegations and protested. The exercise of freedom of assembly across opposing political groups remained important so long as demonstrations respected the law. The parallel dispute over democratic resilience was more demanding: a stable transition required both punishment of proven abuses and an open, fair political contest afterward. The defence of institutions during the December night was decisive, but the longer civic challenge concerned preventing future presidents from treating political opponents as grounds for military emergency.