South Korea's main opposition party threatened on Monday to impeach acting president Han Duck-soo if he failed to proclaim a law to launch a special counsel investigation into President Yoon Suk Yeol's failed bid to impose martial law.

The president faces an accusation of insurrection and, in a first for a sitting leader, the possibility of arrest. Here’s what to know about his political future.

For the United States, the turmoil in South Korea is potentially disruptive to its geopolitical agenda in East Asia.