Overview
- The setting moves the clock four seconds closer than last year’s 89 seconds, marking its closest point since the clock’s creation in 1947.
- Bulletin President and CEO Alexandra Bell announced the change during a publicly streamed event on January 27.
- The Bulletin said humanity made no substantive progress in 2025 on reducing nuclear, climate, biological and cyber threats.
- Science and Security Board chair Daniel Holz warned that New START expires on February 5, which could leave major arsenals without constraints for the first time in more than half a century.
- Russia proposed a one-year extension in September 2025 and, according to the Bulletin’s briefing, a U.S. response had not been reported at the time of the announcement.