Most poweful weapon ever used? Tsar Bomba!

Tsar bomba is a russian nick name given to a hydrogen bomb, the most powerful nuclear bomb ever detonated. The bomb is sometimes referred to as "Kuz'kina Mat'" potentially referring to nikita khruschev's promise which he often said "Kuz'kina Mat'"!!! Which is a famous famous Russian idiom. "Kuz'kina Mat'" translates into “We’ll show you!” Nikita khruschev's was a Russian president during the 1960 UN General Assembly. The remaining bomb casings are located at the Russian Atomic Weapon Museum, in which the bomb was made from. It was decided that such a test blast would create too great a risk of nuclear fallout and a near certainty that the release plane would be unable to reach safety before detonation. This bomb was designed to destroy an entire large city even if dropped five to ten kilometers from its centre.
The bomb was so powerful  Tsar Bomba's fireball, 5miles in diameter, was prevented from touching the ground by the shock wave. The hydrogen bomb nearly reached 6.5 miles in altitude, of the deploying bomber.