Defense authorities worry that Russian President Vladimir Putin may demonstrate his military prowess by showing the Poseidon nuclear torpedo.

According to a senior UK defense source quoted in the Times of London on Monday, NATO allegedly warned its members and allies in an intelligence assessment that the Kremlin intends to test so-called "doomsday" nuclear torpedo drones.

According to other reports, the Belgorod, a large nuclear submarine, has vanished from its home base in the Arctic Circle and maybe its route to conduct a risky and devastating nuclear weapon test known as Poseidon.

Poseidon is a long-range underwater nuclear weapon intended to reach its targets underwater and strike coastal towns at a great distance.\

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