The United States was not aware that South Korea's president intended to declare martial law, U.S. Secretary of State Antony Blinken told Reuters on Wednesday, adding that he anticipated speaking to his South Korean counterpart in the coming days.

South Korean President Yook Suk Yeol’s failed imposition of martial law could hurt the trilateral security cooperation among the U.S., Japan and South Korea, experts say.

After South Korea’s President Yoon Suk Yeol declared martial law this week, the National Assembly nullified the decree only six hours later. As the opposition pushes for an impeachment vote, the chief of Mr.