While South Korea is fast becoming a formidable force to reckon with in the global cryptospace, its North Korean brother has been more interested in using its distributed ledger technology expertise to wreak havoc on the world.
In similar, more law-abiding news, a report from Yonhap on August 27, 2018, indicated that North Korea may be looking towards launching a cryptocurrency exchange rather than the next Ransomware.
https://btcmanager.com/north-korea-moving-crypto-exchanges-mining/North Corea is heavily restricted by the international laws and treaties and the money laundering prevention systems. Even if they mine, they can´t cash it, or not easily at least.