South Korean investigators left the official residence of impeached President Yoon Suk Yeol after a near-six-hour standoff on Friday during which he defied their attempt to detain him. It’s the latest confrontation in a political crisis that has paralyzed South Korean politics and seen two heads of state impeached in under a month.

South Korean anti-corruption investigators failed to arrest impeached President Yoon Suk Yeol after a nearly six-hour standoff with his security team on Friday, showing tensions remain high even after he was impeached and suspended.

The plane crash is the first major test for South Korea’s acting president, Choi Sang-mok, who was appointed the interim leader only on Friday, as the country grapples with a political crisis at the highest levels.