The U.S. has observed a voluntary moratorium on nuclear explosive testing since 1992, relying instead on the Stockpile Stewardship Program for warhead reliability. In October 2025, President Trump directed resumption of testing “on an equal basis” with Russia and China amid U.S. allegations of low-yield or decoupled foreign tests, including a suspected 2020 Chinese event. Subsequent clarifications from administration officials indicated no immediate plans for full-yield explosive tests, emphasizing sub-critical experiments instead. In late September 2026, the National Nuclear Security Administration conducted a non-nuclear chemical high-explosive experiment at the Nevada National Security Site to refine detection algorithms for concealed blasts. Planning documents reference potential execution timelines stretching into 2028, while diplomatic talks with China continue on arsenal transparency and compliance with the Comprehensive Nuclear-Test-Ban Treaty framework.