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

The Poseidon’s power significantly exceeds the power of even our most promising Sarmat intercontinental range missile,” Putin ...

Russian President Vladimir Putin said Tuesday that the country successfully tested its nuclear-powered Poseidon torpedo, a ...

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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.