EXECUTIVE SUMMARY: The summit that took place in Singapore in June 2018 between President Trump and North Korean leader Kim Jong-un likely had a significant impact on the Pyongyang-Tehran nexus. Given the depth of strategic cooperation between the two countries, Iran can be expected to take steps to minimize any challenges that will be posed to that cooperation, either directly or indirectly, by the tentatively developing Pyongyang-Washington relationship.
In the wake of the Singapore summit, it is plausible that North Korea will be required by the US to avoid technology transfer to, and interactions with, other states or entities with regard to military nuclear technologies or armaments. It is not yet known whether Iran will be specifically mentioned during negotiations between Pyongyang and Washington. If it is, there will need to be control measures set up to validate that contact between Tehran and Pyongyang is not taking place. Beyond those agreed-upon control measures, a variety of surveillance steps will have to be taken by intelligence apparatuses checking for hermetic monitoring.
The surreptitious Iranian-North Korean interface has a long history. Its main component is a tight technological cooperation in the fields of missiles and nuclear, chemical, and biological weapons. Each country has its own knowhow that it contributes to that cooperation. Iran substantially foots the bill.