South Korea's parliament has impeached President Yoon Suk Yeol over his martial law decree, ending days of political paralysis.

Impeached South Korean President Yoon Suk Yeol resisted investigators' calls on Monday for him to answer questions over his failed bid to declare martial law this month.

When South Korean President Yoon Suk Yeol cited claims of election hacking and "anti-state" pro-North Korean sympathisers as justification for imposing a short-lived martial law, right-wing YouTuber Ko Sung-kook had heard it before.