Last week Trump said he and the North Koreans "can go slowly" and the two sides do not plan to "sign something" on June 12.
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.
Analysts say the USA wants North Korea to agree to ship some of its nuclear warheads and intercontinental ballistic missiles out of the country within months - a result that could be enough for Trump to claim a victory ahead of the U.S. midterm elections in November.
Washington insiders believe there was anger and growing frustration among Kim's top officials over his handling of talks with the US.
Justices side with baker on same-sex wedding cake
The decision does not give free rein to businesses to discriminate against lesbian, gay, bisexual and transgender people. The justices voted 7-2 that the Colorado Civil Rights Commission violated Phillips' rights under the First Amendment.
The Washington Post earlier published an article suggesting that North Korea allegedly wants another country to pay for Kim Jong-un's stay in the luxurious Fullerton Hotel, where the price for a suite can reach $6,000 per night.
Seoul's unification ministry has said the three firings would be unusual if confirmed.
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". The United States is seeking a negotiated end to North Korea's nuclear weapons program.
The third replacement occurred at the KPA's general political bureau, a hugely influential body tasked with ensuring ideological commitment within the ranks of the army.
£437m Samuel Umtiti release clause ends Jose Mourinho interest
The France centre-back fuelled the speculation in March when he refused to comment on reports he could sign for United. The details surrounding his new buyout clause and total wages should become clear when he puts pen to paper on Monday.
Kremlin spokesman Dmitry Peskov said Kim was invited to take part in an economic forum held in the far eastern city of Vladivostok in September. He's promised American investment in the under-developed country would follow.
"They're all young but capable people", Yang added.
Asked whether the US maximum-pressure campaign against North Korea would continue, Sanders said USA policy had not changed and Washington continued to maintain tough sanctions on Pyongyang.
White House press secretary Sarah Sanders said that she has never heard Hagin say that, telling CNN that "I've worked very closely with Joe and it's just not how his mind thinks or the way that he operates".
The military moves also may be viewed as another step by Kim to underscore his willingness to make bold internal changes ahead of the scheduled June 12 summit with Trump in Singapore. The president also showed unusual politeness, seeing Kim Yong-chol, a former spy chief, off as he departed in a auto.
Germany's Merkel, ECB's Draghi meet for private exchange of views
Merkel's proposals appeared to be somewhat more cautious, but with many points of agreement with her closest European ally.