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  1. Russia, about 3100
  2. US, about 3000
  3. All other countries with nuclear weapons, less than 1000 total

There is no precise answer. America is supposed to have 5000 ready for use at any time, but there are entire nations who don't disclose complete numbers or don't admit nuclear capability for tactical reasons, so any number spat out for how many there are in the world is nieve and simply not based on the reality of the world's political situation. America for instance could have many more, or many less, as nobody is going to be gambling against them to find out by starting a nuclear war we'll probably never know. Enough to wipe out all life on this planet many times over, and that's just one nation. According to one scource, their are 23,300.
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