The big red button: Which world leaders have access to nuclear codes?

If all the nukes in the world are put together and detonated, the massive explosion would trigger a 50-kilometer fireball that would destroy all within a 3,000-kilometer radius of the blast

Nuclear button - Wikipedia

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The big red button

Nuclear weapons of the United Kingdom - Wikipedia

The Cold War proposal to have the president hack an aide to death

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Trump Played Nuke Button Prank on Visitors: Ex-Aide

What Is the Nuclear 'Button' and Where Did It Come From?

From the US to North Korea, the myth of the 'nuclear button

The Cold War proposal to have the president hack an aide to death

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To Launch a Nuclear Strike, President Trump Would Take These Steps

Two-person rule - Wikipedia

The chain of command for potential Russian nuclear strikes