NB: A "dirty bomb" (colloquial name for a radiological dispersal device, or RDD) is not a nuclear weapon. RDDs use conventional chemical explosives with arbitrary radioactive material to, well, disperse those materials.
The military effectiveness of such a weapon is low, except for what it represents as a tool of terror (people generally find radioactive materials terrifying). Threats to human health/life vary with radioactive sources that might be incorporated into a RDD.
Traditionally, RDDs have been a concern in the context of non-state groups precisely because of their ability to inflict disproportionate chaos (particularly if used in urban settings). There is no militarily useful way to employ these devices other than to terrorize.
This literally makes no sense and preys on ignorance & fear.
A short thread of assorted, early thoughts about North Korea's new intermediate-range ballistic missile (pictured below). This is the missile that overflew Japan recently. [1/n] 🧵
First, it's unprecedented for North Korea to introduce and test a new long-range missile type on a "normal" trajectory; usually, they "loft" their large new missiles (firing them at a sharp angle to reduce demonstrated range). [2/n]
That they'd buck this trend and also overfly Japan suggests either a tremendous amount of confidence in this (apparently) new engine (more on that soon), or a greater acceptance of risk. [3/n]
This is basically a North Korean Nuclear Posture Review of sorts and the most significant explicit update to their nuclear strategy since the 2013 law. To be expected as they move toward a more fleshed out posture, including tactical nuclear weapons. (Below excerpt from my book.)
First, everything reported here strikes me as plausible: North Korea has stocks of 122mm/152mm shells/rockets and would be willing to supply (for the right price/return).
Second, the reported transfers would constitute a violation of paragraph 8 of S/RES/2270 (2016) by Russia; North Korea is barred from military exports “that support or enhance the operational capabilities of the armed forces of another [UN] Member State.”