Putin claims successful tests of nuclear-powered Poseidon drone and Burevestnik missile amid Ukraine war.

Russian President Vladimir Putin announced on October 29, 2025, the successful test of the nuclear-powered Poseidon underwater drone, claiming it operated on its reactor for the first time, travels at high speed and depth, and carries a warhead more powerful than Russia’s Sarmat missile. He also reported a successful test of the Burevestnik nuclear-powered cruise missile, stating it flew over 8,700 miles with a compact reactor. The tests, made amid the Ukraine war, underscore Russia’s strategic nuclear advancements, though technical details remain unverified by independent sources.