South Korea's President Yoon Suk Yeol is facing impeachment after attempting to impose martial law last week, sparking a constitutional crisis.** Police have raided the presidential office, and Yoon is under investigation for insurrection and treason. The country's ex-defence minister, who took responsibility for the martial law declaration, attempted suicide while in detention. Many officials close to Yoon have resigned, and protesters are still calling for him to stand down. It's unclear what, if any, authority Yoon now has.