President Trump's late-October 2026 announcement directing the Pentagon to resume nuclear weapons testing "on an equal basis" with rivals initially raised prospects of ending the U.S. moratorium observed since 1992. Energy Secretary clarification quickly followed that planned activities involve non-critical system tests and non-nuclear explosions rather than yield-producing detonations at the Nevada National Security Site. Recent U.S. subsurface chemical high-explosive experiments there focused on improving detection of low-yield foreign tests, such as alleged Chinese activity, without violating the testing norm. Congressional resistance and ongoing diplomatic channels further constrain escalation. These developments sustain trader consensus on low implied probability for an actual nuclear chain-reaction test by late 2026 or early 2027 deadlines.