SEOUL, South Korea — In a landmark legal and political verdict, a South Korean court has sentenced former President Yoon Suk-yeol to life imprisonment after finding him guilty of insurrection and abuse of authority related to his attempt to impose martial law in December 2024. The ruling marks one of the most consequential criminal convictions of a former head of state in South Korea’s modern democratic history.
The Failed Martial Law Declaration
The case stems from Yoon’s abrupt declaration of martial law on December 3, 2024, which he announced amid a standoff with a legislature controlled by the opposition. Yoon argued at the time that declaring martial law and mobilising military and police forces was necessary to address what he described as “anti-state forces” obstructing governance. However, lawmakers viewed the move as an illegal and unconstitutional attempt to paralyse the National Assembly, arrest key political figures and consolidate power.
The martial law declaration lasted only about six hours before a quorum of legislators repeatedly intervened, overturned the decree and impeached Yoon. The Constitutional Court later upheld his removal from office in 2025, and he was arrested and put on trial on charges including rebellion, insurrection and abuse of official authority.
The Verdict and Sentencing
On February 19, 2026, the Seoul Central District Court ruled that Yoon’s actions — including mobilising military and security forces to surround the legislature — amounted to insurrection and a grave violation of the constitutional order. Presiding Judge Jee Kui-youn determined that Yoon’s conduct was intended to establish unchecked power for a “considerable time” and seriously undermined democratic norms.
While prosecutors had sought the death penalty — the maximum possible punishment for insurrection under South Korean law — the court instead opted for a life sentence, citing mitigating factors including the absence of major casualties during the events. South Korea has not executed a death row inmate since 1997, and capital punishment remains a de-facto moratorium in the country.
Yoon, 65, was already detained and had previously received a separate five-year prison sentence for related offenses including resisting arrest and falsifying martial law documents. He denied wrongdoing in the trial and argued that he acted within presidential authority, but the court dismissed those defenses.
Convictions of Associates
The court also convicted several key allies who played roles in enforcing Yoon’s martial law order. Among them:
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Kim Yong-hyun, former Defence Minister, received a 30-year sentence for his role in coordinating military mobilisation.
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Prime Minister Han Duck-soo was sentenced to 23 years for attempting to formalise the decree through falsified Cabinet approval.
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Several other Cabinet officials and aides received prison terms for roles in operationalising the failed martial law plan.
Political and Public Reaction
Yoon’s sentencing has reignited debates across South Korea’s deeply divided political landscape. Supporters of the former president gathered outside the Seoul Central District Court — some calling the prosecution politically motivated and decrying the life sentence as harsh. Critics, however, argue the verdict is a necessary affirmation of the rule of law and democratic accountability.
President Lee Jae-myung, who succeeded Yoon following a snap election, praised the peaceful resistance by the National Assembly and broader democratic society during the December 2024 crisis, calling the court’s decision a reaffirmation of constitutional governance.
Historical and Legal Significance
The verdict is seen as a defining moment for South Korea’s democratic institutions. It underscores the judiciary’s willingness to hold even former presidents accountable for actions deemed unconstitutional or threatening to democratic order. Legal scholars note that South Korea’s history includes periods of authoritarian rule, making the peaceful overturning of martial law and subsequent conviction of a former president especially symbolic.
Yoon is expected to appeal the life sentence, with higher courts likely to weigh in over the coming months or years. Regardless of appeals, the ruling sends a strong signal about the consequences of power misuse and the limits of executive authority in South Korea’s constitutional framework.
Sources
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South Korea’s former President Yoon Suk-yeol sentenced to life in prison after being found guilty of insurrection and imposing martial law.
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Additional reporting on the verdict and political context surrounding Yoon’s sentencing.
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Follow-up on convicting allied officials and legal outcomes.
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