Russia said it tested a nuclear-powered cruise missile and torpedo, two of its experimental weapons, in recent days.

Dmitri S. Peskov, a Kremlin spokesman, told Russian news agencies that recent drone and missile tests were not nuclear weapons tests.

"If it's shown that Russia's using INF-range missiles, which could easily be nuclear, in Ukraine, then that is an issue for European security, not just Ukraine," said John Foreman, a former British defence attache to Moscow and Kyiv.

President Donald Trump on Thursday vowed to begin testing US nuclear weapons “on an equal basis” with Russia and China, heralding a potentially major shift in decades of US policy at a time of growing tensions between the world’s nuclear-armed superpowers.

The test comes days after President Vladimir V. Putin announced the previous trial of another Russian nuclear weapon.

President Trump said Wednesday he directed the Pentagon to immediately start testing U.S. nuclear weapons for the first time since the 1990s to equal testing levels in China and Russia. “The United States has more Nuclear Weapons than any other country.

Russia has successfully tested a nuclear-powered super-torpedo designed to create radioactive tsunamis and wipe out coastal cities

President Vladimir Putin says Russia has conducted a successful test of a new atomic-powered and nuclear-capable underwater drone, declaring that the new weapon can't be intercepted.