Switzerland has ratified the Comprehensive Nuclear-Test-Ban Treaty (CTBT), contributes to the budget and actively participates in the work of the Preparatory Commission for the CTBTO and its working groups.
Switzerland ratified the CTBT in 1999. The treaty, which was concluded in 1996, comes into effect as soon as all those states for which ratification is required have ratified the treaty, as stipulated in the text of the treaty. In Switzerland, the FDFA is primarily responsible for questions concerning the CTBTO.
Switzerland actively participates in the work of the Preparatory Commission for the CTBTO and its working groups, and contributes to its budget. Furthermore, the country maintains a seismic measuring station in Davos which is part of the international monitoring network. In addition to the FDFA, Switzerland is also represented in the CTBT bodies by the Federal Department of Defence, Civil Protection and Sport (DDPS) and the Swiss Seismological Service (SED).