How to deal with North Korea will be "the most important conversation" when U.S. President Donald Trump holds talks with Chinese President Xi Jinping later this week, U.S. Ambassador to the United Nations Nikki Haley said Sunday.

"No longer take the excuses from China that they're concerned too. They need to show us how concerned they are. They need to put pressure on North Korea. The only country that can stop North Korea is China," Haley said on ABC's "This Week."

"When Secretary (Rex) Tillerson went to Beijing, that was a way of putting pressure. You're going to see President Trump meet with President Xi, and a lot of conversation and the most important conversation will be how we're going to be dealing with the nonproliferation of North Korea," she said. Trump is scheduled to hold his first summit with Xi on Thursday and Friday.

China is North Korea's last-remaining major ally and a key provider of food and fuel supplies. But it has been reluctant to use its influence over Pyongyang for fears that pushing the regime too hard could result in instability in the North and hurt Chinese national interests.

U.S. Ambassador to the United Nations Nikki Haley

Trump has made it a key priority of his administration to pressure China to exercise more leverage. Trump has said that the Chinese can solve the problem "very easily if they want to." He welcomed Beijing's recent decision to suspend coal imports from North Korea but said China should put more pressure on Pyongyang.

Trump had even raised questions about why the U.S. should adhere to the "One China" policy of diplomatically recognizing only Beijing, not Taiwan, when China is not helping the U.S. with the North Korea problem, though he later promised to respect the policy.

Asked what the U.S. would do if China does not cooperate, Haley said, "Oh, no, China has to cooperate. This is now down to, 'Do we want to continue to see these ballistic missile attacks from North Korea or does China want to do something about it? '"

The envoy said the U.S. will keep increasing pressure on Beijing.

"They need to have action. And we're going to continue to put pressure on China to have action. That will be shown in multiple ways," she said. "But what we are going to do is say China, you know that you're the only one that's doing this. We appreciate that you stopped coal going into North Korea, but we know it's going in other ways."

Former U.S. Defense Secretary Ash Carter said, however, that he's not optimistic about getting Chinese cooperation now, noting that decades of U.S. efforts to persuade China to rein in North Korea have not worked.

"They haven't used that influence, and so it's hard for me to be optimistic with that," he said on the same program. "Because I am rather pessimistic that they will take that course, I think we need to stand strong with deterrence and defense there."

Carter said the U.S. should not take any option off the table, including military strikes, but caution should be exercised before choosing a military option.

"It's quite possible that they would, as a consequence of that, launch an attempted invasion of South Korea. As I said, I'm confident of the outcome of that war, which would be the defeat of North Korea," Carter said.

"I need to caution you," he said. "This is a war that would have an intensity of violence associated with it that we haven't seen since the last Korean War. Seoul is right there on the borders of the DMZ, so even though the outcome is certain, it is a very destructive war." (Yonhap)

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