South Korea's main opposition party has called for President Yoon Suk Yeol to resign or face impeachment after he ended a short-lived martial law that prompted troops to encircle parliament. Yoon imposed the emergency martial law on Tuesday night, vowing to eliminate 'anti-state' forces, but it was overruled by the National Assembly. The liberal opposition Democratic Party has called on Yoon to quit immediately or face impeachment. Meanwhile, Asian markets have retreated after the political drama in South Korea, though the Kospi in Seoul fell less than 2%. U.S. futures rose while oil prices were little changed.