In addition to its work within the IAEA and the CTBTO, Switzerland's mission is also active within the Nuclear Suppliers Group (NSG), which aims to prevent the proliferation of nuclear weapons.

This is done through the national implementation of agreed guidelines for exports as well as the definition of lists of controlled nuclear goods and dual-use goods that can be used in the nuclear sector (goods that can be used for civilian and military purposes). In view of the significant exports of dual-use goods, active participation in the NSG is also important for Switzerland in representing foreign economic interests. In 1993-1994 and 2017-2018, Switzerland held the chairmanship of the NSG. The Zangger Committee was created before the NSG in order to achieve a uniform understanding of the interpretation of the nuclear export control provisions mentioned in the Treaty on the Non-Proliferation of Nuclear Weapons (NPT).