South Korea's suspended president Yoon Suk Yeol remains defiant in his newly-fortified residence, as investigators seek to extend the arrest warrant over his short-lived martial law order.

For weeks, impeached President Yoon Suk Yeol has remained in his compound and refused to respond to detention and search warrants.

South Korea's presidential guard and military did not allow investigators to arrest ousted President Yoon Suk Yeol during a tense six-hour standoff at the residence in the heart of Seoul, reports Reuters.