Syrian buffer zone for Idlib region is latest use of an old diplomatic tool
The concept of a demilitarization zone goes back almost a half-millennium to Europe's rules on demolishing forts.
Geneva Conventions 1949
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'Low profile' diplomacy: North Korea's hidden avenues to the world
A summit with the U.S. could expand North Korea's little-known involvement with international organizations.
International cooperation is shaped by a history of waterways and wars
The first international organization dates to an 1804 Rhine River treaty. In the 20th century, organizations proliferated.