Reports of new types of sugar in the local markets. Satellite imagery of trains crossing borders. Cargo ships with their transponders off. When assessing North Korea’s opaque economy, rather than hard statistics, it’s these sorts of indicators experts pore over.

And all are pointing to one conclusion: Kim Jong Un has found fresh ways to fill his depleted coffers. This money is enabling him to ignore financial incentives designed to bring North Korea back to the negotiating table, and press ahead with building his nuclear arsenal.

His grandfather, state founder Kim Il Sung, took the reins of the country with Soviet support. Now, as North Korea prepares to mark the 70th anniversary of the armistice that ended the Korean War on July 27, 1953, it’s once again Russia the regime must thank.