South Korea's President Yoon Suk-yeol has replaced Defence Minister Kim Yong-hyun amid impeachment efforts due to a controversial martial law declaration. Kim resigned, taking responsibility for the incident. Yoon appointed retired General Choi Byung-hyuk as the new minister. Opposition parties are pushing for Yoon's impeachment, citing unconstitutional actions. Reactions from neighboring countries vary, with Japan expressing concern. The impeachment process requires a two-thirds majority in the National Assembly, and Yoon faces potential high treason charges.