North Korea took a step toward denuclearization last month when Kim told Pompeo he was ready to allow global inspectors into its nuclear and missile sites - a step North Korea has repeatedly refused to take in the past.
Continuing a long-standing effort to reduce military presences along the demilitarized zone, North and South Korea spent the weekend taking apart a series of guard posts, with 22 posts along the front-lines being totally disarmed, removing all troops and equipment.
The question of how many bases exist in North Korea has been the subject of speculation for decades, but has been carefully concealed through a combination of camouflage, concealment and deception.
North Korean leader Kim Jong Un and U.S. President Donald Trump pledged to work toward denuclearisation at their landmark June summit in Singapore, but the agreement was short on specifics and negotiations have made little headway.
The report, however, noted that the missile operating bases "are not launch facilities" themselves. She also traveled to the USA in May with Kim Yong-chol, vice chairman of the ruling Workers' Party of Korea.
The North has reportedly said that revealing such information would be tantamount to submitting a list of targets the USA could attack.
"I realise I am a broken record, but North Korea has never offered to abandon its nuclear weapons", said Lewis.
The South Korean presidential office said that it is sending 20,000 boxes of tangerines in four shipments on Air Force cargo planes over Sunday and Monday.
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On Wednesday, after his party lost control of the House of Representatives, Mr Trump reiterated: "The sanctions are on".
At the news conference, Trump pointed out that North Korea has not tested further missiles amid the talks. The rockets have stopped.
"The deployment pattern of the KPA's ballistic missile operating bases is logical for a nation that still believes it is in a state of war and must be ready to defend itself from outside aggression at any time", the report said.
Kim has been focused on operational readiness since assuming power in 2011, Beyond Parallel reports.
Led by Joseph Bermudez, an authority of North Korea, the researchers' findings were based on satellite imagery, defector interviews and interviews with intelligence and government officials.
In North Korea, they are typically rudimentary structures with few large buildings, paved roads or security measures.
The operating bases are scattered across the country, typically located in small mountain valleys, the report said.
They nearly always consist of a network of underground facilities to house the unit's transporter-erector-launchers or mobile-erector-launchers, an inventory of missiles and warheads, and other technical or launch support vehicles and equipment.