Russia has not conducted a nuclear explosive test since the Soviet era and maintains a moratorium under the Comprehensive Nuclear-Test-Ban Treaty framework, with the Kremlin repeatedly denying any secret tests as of October 2026. Recent developments center on routine strategic signaling, including Pacific Fleet submarine launches of conventional cruise missiles, annual nuclear accident response drills at facilities like Beloyarsk, and command exercises simulating nuclear authorization procedures. These occur amid broader tensions, including the expiration of New START, U.S. statements on potential test resumption, and Russian warnings of reciprocal measures. Trader assessments of near-term tests reflect the high political and diplomatic costs of breaking the taboo, technical and sanctions constraints on systems like Poseidon, and the absence of verified preparations for an explosive detonation despite ongoing military exercises.