South Korea's impeached President Yoon Suk Yeol has been charged with insurrection after he attempted to declare martial law in December. His ill-fated attempt to impose military rule plunged the country into an unprecedented political crisis and he becomes the first sitting president in South Korean history to be charged with a crime.

A former South Korean defence minister charged with insurrection for his role in a short-lived martial law attempt told a court on Thursday that he wanted a broader military deployment but was overruled by President Yoon Suk Yeol.

South Korean prosecutors have indicted the impeached President Yoon Suk Yeol over his imposition of martial law, Yonhap news agency reported.