"The CSIS report does a great job identifying missile operating bases that analysts have long suspected". Senator Edward Markey, a Democrat member of the Foreign Relations Committee, said on Monday that "President Trump is getting played by Kim Jong-un".
But a report based on satellite imagery shows the complexity posed by an extensive network of weapons facilities that the US wants to neutralize.
However, in recent weeks, negotiations have cooled down as Pyongyang considers that it has already taken several steps but has not had the expected response from Washington, which has neither relaxed the sanctions nor cancelled its joint military manoeuvers with South Korea, something North Korea considers a provocation.
Years of intensive sanctions have severely impacted North Korea's supply of fossil fuels from the outside world.
"The dispersed nature, small size of operating bases, and tactics and doctrine employed by ballistic missile units provide the best chances for their survival given the KPA's technology and capabilities", according to the report, using an acronym to refer to the Korean People's Army.
North Korea abruptly pulled out of planned talks with Pompeo in NY last week, and have so far not sent a delegation to talk to the newly appointed USA envoy for North Korean talks, Stephen Biegun. "We're in no rush", he told reporters last week, when asked about the prospect of a second summit with Kim, adding that the rockets and missiles "have stopped".
North Korea analysts not involved in the report said the findings were not surprising given Pyongyang's past activities but were still cause for concern.
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The bases are scattered across the country in underground facilities tunneled in narrow mountain valleys, according to the CSIS researchers, and designed for mobile missile launchers to quickly exit and move to previously prepared launch sites.
"What North Korea has offered is the beginning of a process that might - might - someday lead to an outcome like that".
Less than 24 hours before Pompeo was scheduled to travel to NY for those meetings, the State Department announced they had been postponed because of a scheduling conflict.
Since last week, North Korea has intensified its calls for Seoul not to participate in the vote via its various media outlets.
North Korea has been engaging in major deception by offering to dismantle a launching site at the same time it secretly continues to make improvements at 16 hidden bases that would bolster launches of conventional and nuclear warheads, The New York Times reported on Monday. Pyongyang said however that it is still interested in pursuing talks and describes Trump as being a more amenable interlocutor than other U.S. officials.
Pyongyang may have wanted the missile sites to be seen, suggested David Maxwell, a senior fellow at the Foundation for Defence of Democracies, to keep the pressure on in negotiations.
Medium-range missiles capable of striking Japan and all of South Korea reportedly are deployed in an operational belt 55 to 100 miles (90 to 150 kilometers) north of the Demilitarized Zone that divides the peninsula.