South Korea’s opposition leader offered Sunday to work with the government to ease the political tumult as officials sought to reassure allies and markets, a day after the opposition-controlled

South Korean President Yoon Suk Yeol was impeached by the opposition-controlled National Assembly on Saturday over his Dec. 3 martial law decree.

South Korea's constitutional court has begun trial proceedings for the impeachment of President Yoon Suk Yeol, who was suspended for declaring martial law and plunging his country into political turmoil.