The Kremlin swiftly rejects Trump’s claims that Russia has resumed nuclear testing, clarifying that Moscow’s recent advanced missile trials—including Burevestnik and Poseidon—aren’t nuclear detonations; Kremlin spokesman Peskov warns Russia would only respond in kind if the US breaks the 33-year test moratorium Trump ordered the Pentagon to end, as nuclear arms rivalry intensifies with both nations tied to the CTBT but neither conducting test explosions since the early 1990s.