South Korea’s impeached President Yoon Suk Yeol was formally arrested on Sunday after a court issued a warrant for his extended detention due to his failed attempt to impose martial law in December. This is the first time in the country that a sitting president has been detained.

Yoon, who was impeached and suspended from office in December, is the first sitting South Korean president to be arrested.

Yoon became the first sitting South Korean president to be arrested. South Korean investigators probing Yoon for alleged insurrection asked a Seoul court on Friday to extend his detention after he refused to be questioned.