SEOUL, July 30 (UPI) -- Former South Korean President Yoon Suk-yeol is being held in solitary confinement under conditions that have prompted concern from his legal adviser. According to his mentor, Shin Pyung, who recently visited him at the Seoul Detention Center, Yoon's treatment is "unfit for a human being" and may constitute a violation of both domestic and international human rights standards. Yoon is confined in 71-square-foot cell with no desk or chair. Instead, he sits on a makeshift