In South Korea, President Yoon Suk-yo has declared martial law. He accuses the country’s main opposition party of trying to unseat his government and of supporting North Korea. The president, who heads a minority government, is also struggling to get a budget approved by parliament. In a televised address, the president accused opposition lawmakers of manipulating the legislative branch and undermining the country’s liberal democracy. Mr. Yoo did not say what he would do next, but promised to root out what he called “anti-state forces” to restore normalcy.