The defendant “disregarded his duty and responsibility as prime minister until the very end”, said Judge Lee Jin-gwan of the Seoul Central District Court.
“We sentence the defendant to 23 years in prison.”
The sentence is eight years longer than prosecutors’ demand.
The 76-year-old career technocrat was ordered to report to prison immediately after the ruling.
Yoon’s stunning imposition of martial law saw armed troops deployed to the National Assembly and the National Election Commission before it was vetoed by the opposition-led parliament.
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