Intelligence reports also state that North Korean officials intend to "deceive Washington about the number of nuclear warheads and missiles" and to also fool global inspectors while hiding some of their facilities.
Kim "put it in black and white: the North Koreans are going to mass produce missiles and nuclear weapons".
Military delegations from North and South Korea held talks on Tuesday in the truce village of Panmunjom, within the demilitarized zone (DMZ) border region, the same site where North Korean leader Kim Jong Un and South Korean President Moon Jae-in met in April.
There is no indication that North Korea is developing new technology, but if confirmed the latest intelligence would raise doubts over the broad commitment Kim Jong-un made to denuclearisation at his summit with President Trump last month.
The reports about new missile construction come after recent revelations about a suspected uranium enrichment facility, called Kangson, that North Korea is operating in secret.
She also noted that large "brightly coloured containers" also showed up in satellite imagery, saying that "containers similar to these have appeared during previous ICBM inspections by Mr Kim". "So there will be discussions that are inclusive of North Korea".
At the Singapore summit in June, Kim agreed in a vaguely worded joint statement to "work toward" the "denuclearization" of the Korean Peninsula.
While it has taken longer than some had hoped, a U.S. State Department official said the process had so far proceeded as expected, and the handover rekindled hopes for progress in other talks with North Korea aimed at its denuclearization.
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The process of identification could take years, according to experts.
Many analysts and independent experts, however, see that dismantling as largely symbolic, since North Korea has now successfully launched ICBMs that use the kind of liquid-fueled engines tested at Sohae.
Since Trump returned from that trip to tell America to "sleep well", North Korea has expanded production of nuclear materials and improved facilities for building missiles.
The North Koreans provided enough specifics about where each suspected body was found that US officials have matched them to specific battles fought from 1950 to 1951, though not necessarily individuals, he said.
The U.S. -led United Nations Command planned a formal repatriation ceremony Wednesday at Osan, where the remains have been examined and catalogued by DPAA. It has in the past two years quickly advanced its nuclear programme. While it was an apparent goodwill gesture by North Korea toward the United States, the return comes amid growing skepticism about whether the North will follow through on its pledge of nuclear disarmament.
Cutting off oil and fuel to the North would require enforcement primarily by China, which supplies most of North Korea's energy needs, but also by Russian Federation, which delivers some oil to Pyongyang.
Reports had indicated that North Korea was upgrading its only official nuclear enrichment site, and was stepping up enrichment at other secret sites.