The commander of a crack South Korean special forces unit told a court Thursday he had been asked by a superior officer how to cut electricity to parliament during last year's failed martial law order by impeached president Yook Suk Yeol.

A top South Korean military commander said on Tuesday he trusted President Yoon Suk Yeol to be making a legitimate decision when he declared martial law, but declined to say if the impeached leader gave orders to "drag" lawmakers out of parliament.

A former military commander who has accused President Yoon Suk Yeol of ordering the removal of lawmakers from the National Assembly building during December's brief imposition of martial law is set to testify at Yoon's impeachment trial Thursday.