FILE PHOTO: U.S. National Security Advisor Robert C. O’Brien attends 7th ASEAN-United States Summit in Bangkok, Thailand, November 4, 2019. REUTERS/Soe Zeya Tun

WASHINGTON (Reuters) - The United States is monitoring North Korea’s actions closely and finds the situation there concerning but there are open lines of communications between the two countries, White House national security adviser Robert O’Brien said on Sunday.

Washington wants to hold North Korean leader Kim Jong Un to his commitment to denuclearize the Korean Peninsula, O’Brien said on ABC’s “This Week.”