Russia has produced the first set of Poseidon nuclear capable super torpedoes that are being developed for deployment on the Belgorod nuclear submarine, TASS reported on Monday, citing an unidentified defence source.

Since a grim New Year’s Eve message describing the West as Russia’s true enemy in the war on Ukraine, President Vladimir Putin has sent several signals that Russia will not back down. He has despatched hypersonic missiles to the Atlantic and appointed his top general to run the war.

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.

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“The first set of Poseidons have been manufactured, and the Belgorod submarine will receive them in the near future,” TASS, a state news agency, quoted the source as saying.

TASS said the main components of Poseidon, including a nuclear reactor to give the torpedo its own power source, had been successfully completed. The crew of the Belgorod nuclear submarine has also completed tests with models of the torpedo, TASS said.

The defence ministry did not immediately respond to a request for comment.

Putin first announced what would become known as Poseidon in 2018, saying it was a fundamentally new type of strategic nuclear weapon, confirming it would have its own nuclear power supply.

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There are few confirmed details about the Poseidon in the public domain but it is essentially a cross between a torpedo and a drone which can be launched from a nuclear submarine.