South Korea's impeached president, Yoon Suk Yeol, was formally arrested early Sunday, days after being apprehended at his presidential compound in Seoul, as he faces possible imprisonment over his ill-fated declaration of martial law last month. Yoon's arrest could mark the beginning of an extended period in custody for him, lasting months or more. The Seoul Western District Court granted law enforcement's request for an arrest warrant for Yoon following an hourslong deliberation, saying he was a threat to destroy evidence. Yoon and his lawyers on Saturday appeared before the court's judge during a hearing and argued for his release. Yoon, who has been in detention since he was apprehended on Wednesday in a massive law enforcement operation at his residential compound, faces potential rebellion charges linked to his declaration of martial law on Dec. 3, which set off the country's most serious political crisis since its democratization in the late 1980s. The Corruption Investigatio