Atomic scientists on Tuesday moved their "Doomsday Clock" closer to midnight than ever before, citing Russian nuclear threats amid its invasion of Ukraine, tensions in other world hot spots, military applications of artificial intelligence and climate change as factors underlying the risks of global catastrophe.

Bulletin of the Atomic Scientists says the United States, China and Russia have the prime responsibility to pull the world back from the brink

The Bulletin of the Atomic Scientists set the clock to 89 seconds before midnight – the theoretical point of annihilation – one second closer than it was set last year