The unexpected martial law decree and swift political fallout shocked the nation and economic markets, unsettling key allies the United States and Europe which had seen Yoon as a staunch partner in global efforts to counter China, Russia, and North Korea.

South Korea’s President Yoon Suk Yeol again declined to appear for questioning by investigators over his martial law declaration as the embattled leader seeks to first defend himself at an impeachment trial.

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.