These I would observe would be for more short range and intermediate range purposes rather than orbital or suborbital Unha (a deriviative of the Taepdong-2, as referred to in Western sources) missiles, ie. the targets would be closer to the DPRK, i.e. South Korea, Japan, and US troops in either of those countries stationed there. But you are correct about the problems of the Unha (”Galaxy”). Its most recent explosion upon ascent was most curious indeed...one wonders what “caused” it. (The one where the Western reporters in Pyongyang knew threw Twitter that the damned thing went into pieces even before their DPRK handlers and briefers could own up to it).
Yes. The North Koreans have deployed a large number of BM25 Musudan IRBMs. It is a copy of the Soviet R-27 Zyb SLBM. Maximum range of 3,200 kilometers. The problem for North Korea is they don’t have the technology to build a nuclear warhead, reentry vehicle and guidance system for the missile.