Russian president Vladimir Putin has unveiled a new weapon.  The unmanned underwater Poseidon drone carries nuclear warheads and is capable of creating a 300-foot tsunami that would destroy any coastal city.

In his state of the nation address, Putin proudly touted Russia's newest weapon. During the address to the Federal Assembly on March 1, Putin described a plethora of nuclear weapons he said Russia was developing. But one of these proposed weapons, an autonomous submarine, stood out among the depictions of falling warheads and nuclear-powered cruise missiles.

The Russian government reportedly leaked a diagram of such a weapon in 2015 that suggested it would carry a 50-megaton nuclear bomb about as powerful as Tsar Bomba, the largest nuclear device ever detonated.

The nuclear-powered underwater drone capable of destroying enemy naval bases and causing huge tsunamis is under construction in Russia, according to a state news agency, TASS. The Poseidon will be able to carry a nuclear warhead with a capacity of up to two megatons, a source told TASS.

The drone will have a speed of 60-70 knots and will be operational at a depth of more than 1km. According to the chief naval commander and as reported by the Mirror UK, the trials of the drone's basic element, the small-sized nuclear powerplant, have already been carried out.