Senior aides to South Korea's impeached President Yoon Suk Yeol offered to resign en masse on Wednesday, a day after his office expressed regret over acting President Choi Sang-mok's approved of two new judges to a court set to decide Yoon's fate.

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.

South Korea's opposition-controlled National Assembly voted to impeach acting President Han Duck-soo, further deepening the country's political crisis.