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Trump says appeasement ‘will not work’ after N.K. nuclear test

North Korea's regime has "succeeded in making a more developed nuke," according to state news agency KCNA. During a visit to the country's Nuclear Weapons Institute "he watched an H-bomb to be loaded into new ICBM," KCNA added.

(CNN) — President Donald Trump condemned North Korea’s claimed test of a hydrogen bomb in a series of tweets Sunday morning, calling Pyongyang’s words and actions “hostile and dangerous” and saying “talk of appeasement will not work.”

“North Korea has conducted a major Nuclear Test. Their words and actions continue to be very hostile and dangerous to the United States,” Trump wrote, adding that Pyongyang “has become a great threat and embarrassment to China, which is trying to help but with little success.”

“South Korea is finding, as I have told them, that their talk of appeasement with North Korea will not work, they only understand one thing!” the President wrote.

Trump will meet with his national security team Sunday to discuss the situation, White House press secretary Sarah Huckabee Sanders said Sunday morning.

“The National security team is monitoring this closely,” Sanders said. “The President and his national security team will have a meeting to discuss further later today. We will provide updates as necessary.”

State Department spokeswoman Heather Nauert tweeted Sunday that Secretary of State Rex Tillerson is making calls to his counterparts, including South Korean Foreign Minister Kang Kyung-wha.

This is North Korea’s sixth-ever test of a nuclear weapon and the first since Trump took office.

The test was a “perfect success” and the final step in attaining a “state nuclear force,” North Korean news anchor Ri Chun Hee said in a televised announcement Sunday.

The news report claimed the weapon was designed to fit atop an intercontinental ballistic missile. The nuclear test follows two successful tests of the long-range missile in July and a shorter-range one in late August.

In a high-level national security meeting, South Korean President Moon Jae-in called the move a “an absurd strategic mistake” that will lead to the international community further isolating Pyongyang.

Japanese Prime Minister Shinzo Abe said in a statement released by his office Sunday that North Korea’s nuclear and missile development “has entered a new level of threat — more grave and imminent — against Japan’s national security and seriously undermines the peace and security of the region as well as the international community.”

The statement adds “given the fact that North Korea has belligerently conducted ballistic missile launches repeatedly this year, the UN Security Council has strongly condemned these actions. Under such circumstances, this nuclear test, which North Korea conducted today despite these calls, is totally unacceptable.”

China, North Korea’s only real ally and patron, said its neighbor “disregarded universal opposition of the international community” by conducting the test.”

“We strongly urge North Korea side to face up to the firm will of the international community on the denuclearization of the peninsula, abide by relevant resolutions of the UN Security Council, stop taking wrong actions that exacerbate the situation and are not in its own interest, and return to the track of resolving the issue through dialogue,” the Chinese Foreign Ministry said in a statement.

Arizona Republican Sen. Jeff Flake said on CNN’s “State of the Union” Sunday that he would like a “measured” response from the Oval Office.

“Obviously, you’d like a leader that is measured and sober and consistent,” Flake said, adding, “We’ve got a good team around the President.”

Flake echoed the administration’s previous statements on the North Korean nuclear threat, saying all options needed to be on the table — including military ones — and said there is no clear path forward to resolving Pyongyang’s continued nuclear development.

“It becomes cliche to say there are no good options here, but there really aren’t,” Flake said.

Tennessee Republican Sen. Bob Corker, chairman of the Senate foreign relations committee released a statement saying that he had spoken with President Trump’s chief of staff John Kelly and made clear his support for “a comprehensive strategy that not only places an emphasis on deterrence but also empowers our allies and partners in the region, who must do far more to confront this threat.”

Texas Democratic Rep. Joaquin Castro said on ABC’s “This Week” that he does not think Trump’s threat last month to rain “fire and fury” down upon North Korea has helped the situation.

“I don’t think that it’s been helpful,” Castro said. “I don’t think that it’s helpful to get in to a Twitter shouting match with a 32-year-old dictator, Kim Jong-un, in North Korea. I think, unfortunately, that it’s escalated the tension and the situation. And he needs to let his diplomats and his military generals and others handle this situation.”

During a meeting at his golf club in New Jersey last month, Trump said in response to the North Korean leader’s threats against the United States that Pyongyang would “be met with fire and fury like the world has never seen.”

Experts say it is nearly impossible to verify with certainty North Korea’s claim that it detonated a hydrogen bomb, which is also known as a thermonuclear weapon, or whether it can actually be used successfully on a missile. Thermonuclear weapons typically use a fission explosion to create a fusion reaction, which is far more powerful than a fission reaction.

NORSAR, an independent seismic monitor, estimated the blast created a yield of about 120 kilotons. The tremors caused by North Korea’s Sunday test were at least 10 times more powerful than the fifth test, Japanese officials said. An official at the Korea Meteorological Administration estimated the blast was about 50 kilotons.

The test came just hours after North Korea released images of Kim inspecting what it said was a hydrogen bomb ready to be put on top of an intercontinental ballistic missile, the type of weapon the country would need to use to deliver a nuclear warhead to far-away locations.

Sunday’s test comes almost one year after Pyongyang’s fifth nuclear test last September, which triggered a 5.3-magnitude seismological event. That took place on September 9, the country’s Foundation Day holiday. North Korea claimed it set off a thermonuclear weapon during that test, but experts said the data showed it was more likely a boosted fission weapon.