As the world rapidly grows more urban, city leaders are turning to a new form of voluntary, locally oriented diplomacy to coordinate with their global peers on sustainable development, infrastructure…

The Trump administration’s approach to ten critical global summits in the year ahead will show whether its pullback from multilateralism in 2017 was an aberration or the start of a new normal.

A little-known treaty provides transparency for confirming arms control agreements and serves as an important measure of the health of the U.S.-Russia relationship.