South Korean prosecutors have arrested former Defense Minister Kim Yong-hyun for his alleged role in President Yoon Suk-yeol’s brief declaration of martial law. Kim resigned just a day after the declaration, which sparked significant political turmoil. Yoon survived a parliamentary vote of no confidence but faces calls for his resignation. Multiple opposition parties have filed complaints against Yoon, Kim, and military chief Park An-soo, as investigators explore allegations of treason. The situation has plunged South Korea into a major political crisis.