Yoon Suk Yeol, South Korea’s since-impeached president, had been planning for months to impose martial law and target political opponents, according to accounts.

South Korean President Yoon Suk Yeol's abrupt announcement of martial law shocked the world in December. The ensuing political crisis attracted our readers' eyes, as Yoon eventually faced impeachment. (Photo by Korean Presidential Office/Kyodo)

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.