U.S. promises action on any North Korea missile test -White House

WASHINGTON, Dec 29 (Reuters) - The United States would be very disappointed if North Korea tested a long-range or nuclear missile and would take appropriate action as a leading military and economic power, White House national security adviser Robert O'Brien said on Sunday.

Washington has many "tools in its tool kit" to respond to any such test, O'Brien said in an interview with ABC's "This Week."

"We'll reserve judgment but the United States will take action as we do in these situations," he said. "If Kim Jong Un takes that approach we'll be extraordinarily disappointed and we'll demonstrate that disappointment."

North Korea has asked Washington to offer a new initiative to iron out differences over Pyongyang's nuclear weapons program. It warned Washington this month that failure to meet its expectations could result in an unwanted "Christmas gift."

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U.S. President Donald Trump shakes hands with North Korean leader Kim Jong Un at the Capella Hotel on Sentosa island in Singapore June 12, 2018. REUTERS/Jonathan Ernst TPX IMAGES OF THE DAY
U.S. President Donald Trump and North Korea's leader Kim Jong Un leave after signing documents that acknowledge the progress of the talks and pledge to keep momentum going, after their summit at the Capella Hotel on Sentosa island in Singapore June 12, 2018. REUTERS/Jonathan Ernst TPX IMAGES OF THE DAY
U.S. President Donald Trump shakes hands with North Korea's leader Kim Jong Un after they signed documents that acknowledged the progress of the talks and pledge to keep momentum going, after their summit at the Capella Hotel on Sentosa island in Singapore June 12, 2018. REUTERS/Jonathan Ernst
U.S. President Donald Trump and North Korea's leader Kim Jong Un walk during their summit at the Capella Hotel on Sentosa island in Singapore June 12, 2018. Anthony Wallace/Pool via Reuters TPX IMAGES OF THE DAY
U.S. President Donald Trump and North Korea's leader Kim Jong Un attend a signing ceremony during a summit at the Capella Hotel on the resort island of Sentosa, Singapore June 12, 2018. REUTERS/Jonathan Ernst
U.S. President Donald Trump and North Korea's leader Kim Jong Un walk during their summit at the Capella Hotel on Sentosa island in Singapore June 12, 2018. Anthony Wallace/Pool via Reuters
U.S. President Donald Trump and North Korea's leader Kim Jong Un shake hands during the signing of a document after their summit at the Capella Hotel on Sentosa island in Singapore June 12, 2018. Susan Walsh/Pool via Reuters
U.S. President Donald Trump and North Korea's leader Kim Jong Un react during their summit at the Capella Hotel on Sentosa island in Singapore June 12, 2018. Anthony Wallace/Pool via Reuters
U.S. President Donald Trump and North Korea's leader Kim Jong Un look at each others before signing documents that acknowledge the progress of the talks and pledge to keep momentum going, after their summit at the Capella Hotel on Sentosa island in Singapore June 12, 2018. They are flanked by Kim Yo Jong, sister of North Korean leader Kim Jong Un, and U.S. Secretary of State Mike Pompeo. REUTERS/Jonathan Ernst
U.S. President Donald Trump and North Korean leader Kim Jong Un walk in the Capella Hotel after their working lunch, on Sentosa island in Singapore June 12, 2018. Susan Walsh/Pool via Reuters
U.S. President Donald Trump walks with North Korean leader Kim Jong Un at the Capella Hotel on Sentosa island in Singapore June 12, 2018. Kevin Lim/The Straits Times via REUTERS ATTENTION EDITORS - THIS PICTURE WAS PROVIDED BY A THIRD PARTY
U.S. President Donald Trump walks with North Korean leader Kim Jong Un at the Capella Hotel on Sentosa island in Singapore June 12, 2018. Kevin Lim/The Straits Times via REUTERS ATTENTION EDITORS - THIS PICTURE WAS PROVIDED BY A THIRD PARTY
U.S. President Donald Trump and North Korean leader Kim Jong Un react at the Capella Hotel on Sentosa island in Singapore June 12, 2018. REUTERS/Jonathan Ernst TPX IMAGES OF THE DAY
U.S. President Donald Trump gestures next to North Korea's leader Kim Jong Un before their bilateral meeting at the Capella Hotel on Sentosa island in Singapore June 12, 2018. REUTERS/Jonathan Ernst
TOPSHOT - Pedestrians walk in front of a screen showing a news report displaying portraits of US President Donald Trump and North Korean leader Kim Jong Un, in Tokyo on June 12, 2018. - Trump and Kim have become on June 12 the first sitting US and North Korean leaders to meet, shake hands and negotiate to end a decades-old nuclear stand-off. (Photo by Martin BUREAU / AFP) (Photo credit should read MARTIN BUREAU/AFP/Getty Images)
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U.S. military commanders have said the North Korean move could involve the testing of a long-range missile - something North Korea has suspended, along with nuclear bomb tests, since 2017.

O'Brien said the United States and North Korea had open channels of communication but did not elaborate. He said Washington hoped North Korean leader Kim Jong Un would live up to his commitments to denuclearize the Korean Peninsula.

The United States was still the leading military power in the world and had tremendous economic power, said O'Brien. "There's a lot of pressure that we can bring to bear," he said.

North Korea threatened a Christmas surprise, despite the fact that Trump and Kim have engaged in personal diplomacy over the years and have a good personal relationship, O'Brien said.

"So perhaps he's reconsidered that," O'Brien added. "But we will have to wait and see. We're going to monitor it closely. It's a situation that concerns us, of course."

Kim convened a meeting of top ruling party officials on Saturday to discuss important policy matters ahead of the year-end deadline set by Kim for the United States, the state news agency said on Sunday.

Senator Ben Cardin, a Democrat on the U.S. Senate Foreign Relations Committee, said meetings between the two leaders have produced "very little" on denuclearization.

"So what I want to see, I want to see is the leader of North Korea, Kim Jong Un, make a full declaration of his nuclear weapons program and make a real commitment to start to dismantle that," he said. "We haven’t seen any of that during the Trump administration." (Reporting by Doina Chiacu; Additional reporting by Lindsay Dunsmuir; Editing by Rosalba O'Brien and Tom Brown)

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