South Korea’s Constitutional Court has formally removed President Yoon Suk Yeol from office by upholding his impeachment over his imposition of martial law in December.

South Korea is bracing for a potentially violent public reaction to a Constitutional Court ruling on Friday on whether to remove impeached President Yoon Suk Yeol from office or reinstate him amid the country's worst political crisis in decades.

The unanimous verdict came more than three months after the opposition-controlled National Assembly voted to impeach him.