The official in charge of the U.S. effort to enforce the new penalties, Philip Goldberg, met with counterparts in China on Thursday.

WSJ: Pyongyang Fires Missiles

He expelled DEA agents in 2008 along with US Ambassador Philip Goldberg, accusing them of conspiring against his government - charges the US has always rejected.

BBC: President Evo Morales on 10 March 2011

Even as Bill Clinton sat with Kim Jong Il, Philip Goldberg, a top administration official, is in Moscow seeking Russia's support to implement tough sanctions against North Korea.

CNN: Analysis: Clinton to North Korea -- a matter of respect