Yoon Suk Yeol, South Korea’s impeached president, who is standing trial on insurrection charges over his decision to impose martial law in December, was released from a detention center on Saturday, a day after a court ruled that his detention was invalid.

       The Seoul Central District Court ruled on Friday that prosecutors had violated procedural rules by holding Mr. Yoon in detention longer than legally allowed before indicting him in January. The procedural violation rendered Mr. Yoon’s detention invalid, the court said.

       Prosecutors, who had a week to appeal the decision, requested instead that he be released.

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