The Big Bomb

Father of all bombs as opposed to Mother of all bombs. Russians, in a slight revival of cold war competition, created the largest non-nuclear bomb - air delivered thermobaric weapon - on the planet fairly soon after US announced the largest non-nuclear bomb (now, apparently, the second largest) - Massive Ordnance Air Blast Bomb. Both are thermobaric or fuel-air bombs, i.e., oxygen used to create and sustain the explosion is obtained from the surrounding air instead of using oxidizing agent normally used in traditional bombs.

The Bomb and Explosion

The results of tests of the aviation explosive device that has been created have shown that it is comparable with nuclear weapons in its efficiency and potential,” Alexander Rukshin, a deputy chief of the Russian armed forces staff, told the channel. “You will now see it in action — the bomb which has no match in the world is being tested at a military site,” said the report. It showed a Tupolev 160 strategic bomber dropping the bomb over a testing ground. A large explosion followed. [Russia unveils “father of all bombs” - The Hindu]

So even if nuclear bombs are banned, a big if, the potential for destruction by regular bombs will still be huge - almost equal to nuclear bombs.