South Korea's ex-president denies insurrection at criminal trial

South Korea's former president Yoon Suk Yeol denied he had committed insurrection Monday, as the impeached leader appeared in court on the first day of his criminal trial over his martial law declaration.

Yoon was formally stripped of office earlier this month, after being impeached and suspended by lawmakers over his December 3 attempt to subvert civilian rule, which saw armed soldiers deployed to parliament.

He became South Korea's first sitting head of state to be arrested in January in connection to the criminal case against him, although he was later released on procedural grounds.

Yoon attended the trial at Seoul Central District Court on Monday morning and was asked by the justices to state his name, date of birth and other personal information, according to pool reports.

Yoon is accused of insurrection over his abortive martial law declaration, but his legal team denied all the charges, with the former president then taking to the stand to defend himself.

"To frame an event that lasted only a few hours, was non-violent, and immediately accepted the dissolution request from the National Assembly as insurrection... strikes me as legally unfounded," Yoon told the court.

Yoon, himself a former prosecutor, asked the court to display the prosecution's presentation on a courtroom monitor, and proceeded to rebut their opening statement point by point, according to pool reports.

The prosecution argued that Yoon "planned to incite an uprising with the intent to subvert the constitutional order."

They gave evidence including Yoon's planning of the martial law in advance and his deployment of the military to the parliament, with orders to break windows and cut the power.

Long trial ahead

The court will hear witness testimonies from two military officers called by prosecutors, including one officer who claims he was instructed by top commanders "to drag out the lawmakers gathered in the National Assembly to lift the martial law."

Lawmakers defied armed soldiers and climbed over fences in order to gather in parliament and vote down Yoon's martial law declaration, forcing him to backtrack in a matter of hours.

Experts say his criminal trial is likely to be a lengthy one.

"The first verdict is likely to be delivered around August, but the case involves around 70,000 pages of evidence and numerous witnesses. So if deemed necessary by the court, the trial may be extended," lawyer Min Kyoung-sic told AFP.