North Korea and Iran have a decades-long history of close military cooperation, especially in the field of ballistic missile technology. Both being traditionally classed as adversaries with the West, subject to international sanctions and feeling a need to develop military capabilities for use as a deterrent and a means to project power, Pyongyang and Tehran have shared ballistic missile-related technology, equipment and information for many years.

But does the relationship still exist? And in the face of sanctions prohibiting direct military trade between the two countries, in what ways may the pair still be cooperating?