President Joe Biden said on Thursday that 'for the first time since the Cuban missile crisis' the world faces 'the prospect of Armageddon'.
Mr Putin himself has also threatened the use of Russia's vast nuclear arsenal.
And after Moscow staged 'referenda' on annexing four areas of Eastern Ukraine, its leader could also use a Ukrainian attack on any of those territories to justify a nuclear strike.If that did happen, NATO would have to respond, but currently officials have suggested they would only use conventional weapons in retaliation.
In response, then-US president John F Kennedy ordered a naval quarantine of the island to prevent further missiles from being delivered. Designed to prepare people for a nuclear attack and supposedly give them the best chance of surviving, it came in the form of pamphlets, TV and radio adverts.Nuclear threat readiness video from 1975
"We shall bring you further information as soon as possible. Meanwhile, stay tuned to this wavelength, stay calm and stay in your own house."Air sirens used in the Second World War were repurposed and would be used to deliver attack warnings and 'fallout warnings' in the event of a nuclear incident.
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