France conducts first submarine launch of upgraded M51.3 SLBM

France test-fired the upgraded M51.3 submarine-launched ballistic missile from an SSBN for the first time, demonstrating the new variant’s operational readiness after overhaul. The M51.3 is described as improving range, accuracy and penetration against missile defenses, and is associated with the TNO-2 warhead and MIRV capability, indicating a notable modernization step in France’s sea-based deterrent.