Former South Korean President Yoon Suk Yeol was convicted on Thursday of orchestrating an insurrection and received a life sentence for his short-lived declaration of martial law in 2024, in a verdict that brings a dramatic close to what has been the nation's most severe political turmoil in decades.

The conservative leader was ousted from office after he declared martial law and sent troops to surround the National Assembly on Dec. 3, 2024, in a baffling attempt to overcome a legislature controlled by his liberal opponents.

Judge Jee Kui-youn of the Seoul Central District Court said he found Yoon, 65, guilty of rebellion for mobilizing military and police forces in an illegal attempt to seize the Assembly, arrest political opponents and establish unchecked power for an indefinite period.

Yoon's martial law imposition, the first of its kind in more than four decades, recalled South Korea's past military-backed governments when authorities occasionally proclaimed emergency decrees that allowed them to station soldiers, tanks and armored vehicles on streets or in public places such as schools to prevent anti-government demonstrations.

As lawmakers rushed to the National Assembly, Yoon's martial law command issued a proclamation declaring sweeping powers, including suspending political activities, controlling the media and publications, and allowing arrests without warrants.