White House national security adviser Robert O'Brien has said the United States attempted to contact North Korea in a bid to restart deadlocked nuclear talks, according to an interview published Sunday by news website Axios.

"We've reached out to the North Koreans and let them know that we would like to continue the negotiations in Stockholm that were last undertaken in early October," O'Brien said.

He said that Washington had been "letting them know, through various channels," that the U.S. is looking to get the negotiations back on track "and to implement Chairman Kim's commitment" to the denuclearization of the Korean Peninsula.