But South Korean analysts who spoke to local newspaper Chosun Ilbo say Kim is making the move not necessarily to remove disloyal personnel, but to mitigate the risk of opposition from officers who oppose denuclearization.
Trump wants North Korea to "denuclearize", meaning to get rid of its nuclear arsenal, in return for relief from economic sanctions.
Moon Chung-in, an adviser to President Moon, said in a recent interview with the Atlantic, that he would like to see the end of the US alliance at some point after the North Korean nuclear threat is resolved, so that South Korea no longer has to take sides between the USA and China.
The US imposed those sanctions two years ago, as part of the Obama administration's effort to isolate North Korea, but it came as the Kim government rapidly developed its nuclear program.
Trump said last week he no longer wanted to use the phrase "maximum pressure" to describe the campaign because North Korea was being more cooperative, even though the United States is keeping current sanctions in place.
The U.S. official did not identify the three ousted military officials.
The U.S. delegation to the preparatory talks for the summit have stayed at the hotel.
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They also insist in the letter that North Korea commit to "robust compliance inspections" that "including "anywhere, anytime" inspections" of both declared and non-declared "suspicious sites".
But he warned that he expected a number of summits would be needed to iron out all outstanding issues.
The Eastern Economic Forum, which is traditionally used by Russian Federation to attract investors from Pacific nations, is scheduled to take place this year, on September 6 and 7. North Korea's leadership is believed to regard nuclear weapons as crucial to its survival.
'They're all young but capable people, ' Yang said.
After the meeting with Kim on Friday, Trump said to reporters, "We did not talk about human rights, no".
Trump and Kim will meet at 9 a.m. Singapore time on June 12, White House Press Secretary Sarah Huckabee Sanders said on Monday.
Trump revived the June 12 summit in Singapore on Friday after canceling it a week earlier. While in China, he may have reported to Beijing officials the results of his trip to the United States, where he held meetings with Secretary of State Mike Pompeo in NY over Wednesday and Thursday before meeting with Trump on Friday.