Pompeo, N. Korean official open summit prep talks

Russian Foreign Minister Sergey Lavrov is set for talks in North Korea

Would U.S. troops remain on the Korean peninsula. It expresses the North Korean leader's interest in meeting without making any significant concessions or threats, the Journal said, citing a foreign government official who had been briefed on the letter.

Trump also added that expected very positive results from North Korea.

The Korean War has been largely frozen since an armistice ended hostilities, but not the underlying conflict, in 1953.

His travel restrictions were lifted this week so he could fly to NY and Washington, DC to meet U.S. officials, the Department of State said.

Mr Trump said it was "a very interesting letter and at some point it may be appropriate" to share it.

"Can you believe we're talking about the ending of the Korean War?" USA and North Korean envoys have also been meeting in Panmunjom in the Demilitarised Zone between North and South Korea, and an American team is in Singapore to make logistical arrangements for the meeting. Siegfried Hecker of Stanford University, who once ran the USA atomic lab in Los Alamos, has said that from a technical point of view alone, verifiable disarmament could take 15 years.

"This is going to be a process that will take days and weeks to work our way through", he said.

After an informal dinner on Wednesday, Pompeo and Kim Yong Chol were meeting at the three-bedroom apartment residence of the U.S. deputy ambassador to the United Nations.

Kim Yong Chol was the highest-ranking North Korean official to visit the White House in 18 years - and he needed a waiver to get into the country.

The Russian foreign ministry also released pictures of the two men shaking hands and smiling.

Trump's meeting with Kim Yong Chol and other North Korean officials lasted around an hour and 20 minutes.

Despite the upbeat messaging in the United States, Kim Jong Un, in a meeting with Russia's foreign minister on Thursday, complained about the USA trying to spread its influence in the region, a comment that may complicate the summit plans. In 2011, during the heady early months of the Arab Spring, mostly-Western airpower protected Libyan rebels from being crushed by regime forces and then enabled them to win the ensuing civil war in a seven-month effort that cost the United States just a few billion dollars and no USA servicemembers' lives.

Secretary of Defense Jim Mattis, however, said Saturday that the presence of American troops in South Korea is not "on the table" at the Trump-Kim summit.

It upset Pyongyang because after Libyan leader Muammar Gaddafi shutdown his nuclear programme in 2003 after which he was overthrown and killed in 2011 following attacks by USA and its European allies.

He added there may even need to be a second or third summit meeting to reach a deal on North Korean denuclearization but still hedged, saying "maybe we'll have none". "He's toning down his rhetoric, he's emphasizing positive things and he's just on a glide path to what he hopes will be a successful meeting".

For Yun, Kim's seriousness and the relative success of Singapore talks will only be confirmed "if there are deliverables that are concrete and quick, and that is clearly what our side will be looking for".

Kim's letter seemed to be a sign that the summit might now go ahead.

Giving Kim that kind of exposure means Trump better get a good deal, Chang said, one that includes having North Korea give up all nuclear weapons and missiles.

Frenetic meetings - Pompeo has scheduled a news conference on Thursday, at the end of his meetings with Kim.

Onodera told an global security conference in Singapore, which is hosting the June 12 summit between President Donald Trump and North Korean leader Kim Jong Un, that the only way to bring peace to the Korean Peninsula is to "ensure that North Korea will take concrete actions towards realizing the (complete, verifiable and irreversible dismantlement) of all weapons of mass destruction and ballistic missiles of all flight ranges in accordance with the series of U.N. Security Council resolutions".

"There's got to be a balance here between "get-to-know" and a detailed blueprint" for moving forward, said Aaron David Miller, a former negotiator for US secretaries of State from both parties. He may be ready to make this strategic shift that Pompeo talked about. "This will obviously be their decision", he said.

His reversal came after receiving a letter from Kim, hand delivered to the White House by the dictator's top envoy.

There was no immediate indication of what that might mean for the planned first summit between the U.S. and North Korea after six decades of hostility.

"We will calmly, and with expectation, watch the historic meeting in Singapore".