Russia claims the Poseidon 'doomsday machine' can destroy cities with radioactive tidal waves - here are the facts ...

Vladimir Putin says Russia has tested its nuclear-powered Poseidon torpedo, calling it unmatched in global weaponry.

U.S. and Russian officials have both described Poseidon as a new category of retaliatory weapon, capable of triggering radioactive ocean swells to render coastal cities uninhabitable.

The Poseidon nuclear-powered super torpedo is capable of devastating coastal regions by triggering vast radioactive ocean swells, military analysts say.