The United States is currently the chair of the dialogue among the five Nuclear Weapon States in an ongoing exchange in the context of the Nuclear Non-Proliferation Treaty.
In this capacity, the United States organized a working-level experts meeting with counterparts from the People’s Republic of China, France, the Russian Federation, and the United Kingdom of Great Britain and Northern Ireland on August 2 in Vienna.
Participants discussed strategic risks and measures to reduce those risks. They welcomed the professional approach of the delegations and noted the significance of the substantive and informative expert-level discussions over the course of the last year. They also affirmed the need to continue these challenging but important discussions.
Source : Department States