South Korean police have questioned Prime Minister and Acting President Han Duck-soo as part of an investigation into the short-lived decision this month to impose martial law, an official at his office said on Friday.

For the United States, the turmoil in South Korea is potentially disruptive to its geopolitical agenda in East Asia.

President Yoon Suk Yeol is facing parliamentary moves to impeach him after he sent heavily armed forces into Seoul’s streets with his declaration of martial law.