Satellite photographs taken in the last month indicate that the regime may be working on one or two liquid fuel intercontinental ballistic missiles (ICBMs), officials told The Washington Post. Mr Trump later said North Korea was "no longer a nuclear threat".
However, a U.S. official told news agency Reuters that a liquid-fuelled ICBM didn't "pose almost the threat that a solid-fuelled one would because they take so long to fuel".
The return of the remains is the first major achievement for the Trump administration since the June 12 Singapore summit between President Donald Trump and North Korean leader Kim Jong Un, which was aimed at the "denuclearization" of North Korea's arsenals.
North Korea gave the USA the remains last week in the coastal city of Wonsan, North Korea, as part of an deal reached last month during President Donald Trump's historic summit with North Korean leader Kim Jong Un in Singapore. A USA military plane made a rare trip into North Korea to retrieve the 55 cases.
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Earlier this month, media reports revealed that the North was secretly operating a suspected uranium enrichment facility, called Kangson.
It's not clear that North Korea has moved on to a new era of being extra deceptive ... because the current levels of deceptions seem to have been serving it well. Appearing before the Senate Foreign Relation Committee last week, Secretary of State Mike Pompeo acknowledged that North Korean factories "continue to produce fissile material" used in making nuclear weapons.
Many experts cautioned that the situation was still extremely risky, as Kim only signed a vague mutual commitment to denuclearize the Korean peninsula - a promise North Korean leaders have made and broken multiple times.
But some experts remain skeptical, claiming that Kim had already conveyed his true intentions during his annual New Year's speech in January.
Initial forensic analysis suggested the remains were likely to be of American servicemen, the US military said.
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North Korea halted nuclear and missile tests, shut down its nuclear testing site and began dismantling facilities at its rocket launch site.
Kim Do-gyun, the South's chief negotiator who is in charge of North Korea policy at the Ministry of National Defense, told reporters before leaving for the DMZ that he would make efforts to craft "substantive" measures to ease tensions and build trust.
"The Korean War fallen have never been forgotten by the United States of America nor the 16 other sending states that comprise the UNC". The government has said only that the UN Security Council -where China and the United States both wield vetoes - should revisit sanctions after Kim's meeting with Trump. The North had pursued its nuclear and missile programs in defiance of U.N. Security Council resolutions and increasingly severe sanctions. Service members from countries including Australia, Belgium, France and the Philippines also have not been recovered from North Korea.
In recent months, United States agencies have raised their estimates of the size of North Korea's nuclear arsenal.
The recovery efforts stalled for more than a decade because of a standoff over North Korea's nuclear ambitions and a previous USA claim that security arrangements for its personnel working in the North were insufficient.
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Ambassador Haley reminded the United Nations of how far they have come with the North since then. As for the broader global community, she said, "we ask you to hold tight as we go forward".