South Korea’s impeached President Yoon Suk Yeol was formally arrested early on Sunday, days after being apprehended at his presidential compound in Seoul. He faces possible imprisonment over his ill-fated declaration of martial law last month.

With the court’s approval of the warrant, investigators can now hold him for up to 20 days, including the time he has already spent at a detention center. If convicted of insurrection, Yoon could face