He played a crucial diplomatic role during the death of the Bretton Woods financial system in the early 1970s, which severed the link between money and gold and ushered in floating exchange rates.
The two countries reopened all cross-border communication lines last week, including military hotlines, which were severed over one year ago by Pyongyang.
In addition to fully implementing all UN sanctions all countries should sever diplomatic relations with North Korea and limit military, scientific, technical or commercial cooperation.