The U.S.-Russia New START arms control treaty expired on February 5, ending the last legally binding bilateral limits on their deployed strategic nuclear forces.

The excerpt states that New START’s expiration removes verifiable caps and monitoring provisions that had limited deployed strategic warheads and delivery systems, including inspection rights, data exchanges, and protections for national technical means; it also notes Russia announced a suspension of participation in February 2023 and the U.S. later withheld its own data and notifications, with successor-treaty talks described as stalled through 2024–2025.