If you are having a hard time keeping up with the latest sanctions on North Korea, you are not alone. (The U.S. Treasury Department announced them on 24 January.)

Outside of the small group of people for whom such stuff is the vital life's blood of specialization - the UN Panel of Experts, Treasury-types, and a very small handful of think tankers who tend to have sub-interests in missile technology and satellite imagery - everyone is on the back foot trying to get up to speed.