South Korea's opposition Democratic Party on Monday urged the country's Constitutional Court to swiftly rule on President Yoon Suk Yeol's impeachment, saying keeping the country waiting is "irresponsible" and deepening social division.

The Constitutional Court is expected to decide in the coming days whether to oust Yoon in a case that ignited South Korea's worst political crisis in decades and rattled markets. In central Seoul, anti-Yoon protesters filled a large square,

SEOUL (Reuters) - South Korea's acting President Choi Sang-mok called on Monday to avoid any negative impact in science technology and energy cooperation with the United States, after the U.S. Department of Energy designated South Korea as a 'sensitive' country, the finance ministry said in a statement.

By Timothy Gardner, David Brunnstrom and Ju-min Park WASHINGTON/SEOUL (Reuters) - The U.S. Department of Energy has designated ally South Korea a "sensitive" country, a spokesperson said on Friday, after the South Korean president briefly imposed martial law and amid talk of Seoul potentially developing nuclear weapons.