'If Vladimir Putin uses tactical nuke weapon, world would face Armageddon', says US President Joe Biden

In his most outspoken remarks about the threat of nuclear war, US President Joe Biden warned that the world could face an "Armageddon" if his Russian counterpart Vladimir Putin used a tactical nuclear weapon to try to win the ongoing war in Ukraine.

Addressing a Democratic fundraiser in New York on Thursday, Biden said it was the closest the world had come to nuclear catastrophe for 60 years, The Guardian reported. "We have not faced the prospect of Armageddon since Kennedy and the Cuban missile crisis," he said.

"We've got a guy I know fairly well," Biden said in a reference to the Russian President.

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"He's not joking when he talks about the potential use of tactical nuclear weapons or biological or chemical weapons because his military is, you might say, significantly underperforming."

Putin and his officials have repeatedly threatened to use Russia's nuclear arsenal in an effort to deter the US and its allies from supporting Ukraine and helping it resist the all-out Russian invasion launched in February, said The Guardian report.

One fear is that he could use a short-range "tactical" nuclear weapon to try to stop Ukraine's counter-offensive in its tracks and force Kiev to negotiate and cede territory, the report added.

If Russia did use a nuclear weapon, it would leave the US and its allies with the dilemma of how to respond, with most experts and former officials predicting that if Washington struck back militarily, it would most likely be with conventional weapons, to try to avert rapid escalation to an all-out nuclear war.

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But Biden said on Thursday night, "I don't think there's any such thing as the ability to easily (use) a tactical nuclear weapon and not end up with Armageddon.

"We are trying to figure out what is Putin's off-ramp. Where does he find a way out? Where does he find himself where he does not only lose face but significant power?"

US intelligence agencies believe that Putin has come to see defeat in Ukraine as an existential threat to his regime, which he associates with an existential threat to Russia, potentially justifying, according to his worldview, the use of nuclear weapons.