President Yoon Suk Yeol’s security service stopped an effort to detain him on insurrection charges and has vowed to do so again. Its roots are in the era of military dictatorships.

For weeks, impeached South Korean President Yoon Suk Yeol has holed up inside his guarded residential compound, as government officials try to figure out how to detain him and search the premises. Scuffles broke out late last week as dozens of investigators were stopped from entering the compound by hundreds of presidential security forces and a barricade.

South Korea’s presidential guards and military troops prevented authorities from arresting Yoon Suk Yeol, the impeached president, on Friday in a tense six-hour stand-off inside his compound in the heart of Seoul.