South Korea's Constitutional Court is set to rule on whether to dismiss or reinstate impeached President Yoon Suk Yeol, four months after he threw the country into turmoil with an ill-fated declaration of martial law.

Tension is mounting in Seoul as the constitutional court is set to decide whether Yoon Suk Yeol will be removed.

South Korea's Constitutional Court will rule on Friday whether to remove or reinstate impeached President Yoon Suk Yeol over his short-lived martial law declaration that sparked a crisis in a country seen as a democratic success story.