South Korean President Lee Jae Myung vowed “strict accountability” for the perpetrators behind last year’s failed martial law attempt by former leader Yoon Suk Yeol, calling the upheaval a test of the country’s democratic resilience.

Speaking in a special address to the nation, Lee described the events of Dec. 3 as a “revolution of light,” according to an English translation by Ariang News, and said that this “revolution” was incomplete.

He added that investigations and trials tied to the insurrection remain underway.

The former president is currently on trial for insurrection, while prosecutors have reportedly sought a 15-year prison term for former prime minister Han Duck-soo.

Other senior officials, including Yoon’s defence minister and the former head of the National Intelligence Service, have also been arrested in connection with the attempt to impose military rule.