New Mongols points to an interesting article on how Mongolia could exert positive force for change in North Korea.:

By encouraging the minuscule economic reforms in North Korea, Mongolia hopes it can offer Pyongyang a carrot to complement the US stick, Baabar said.
Doing this is in Mongolia’s interest because North Korea’s peaceful transition to a more open system would foster economic growth in the region, and open up the possibility of a trade pipeline between the Koreas and Europe, via Russia and Mongolia.

Given that North Korea has resisted constant pressure from China and the South to open its economy, I have serious doubts that Ulaan Baatar can do much to influence Pyongyang. But it’s nice that an attempt is being made.