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Biden says nuclear ‘Armageddon’ risk highest since Cuban missile crisis
Russian officials have spoken of the possibility of using tactical nuclear weapons after suffering massive setbacks in the eight-month invasion of Ukraine
The risk of a nuclear "Armageddon" is at its highest level since the 1962 Cuban Missile Crisis, US President Joe Biden has said.
Mr Biden said Russia's President Vladimir Putin was "not joking" when he spoke of using tactical nuclear weapons after suffering setbacks in Ukraine.
The US was "trying to figure out" Mr Putin's way out of the war, he added.
The US and the EU have previously said Mr Putin's nuclear sabre-rattling should be taken seriously.
However, the US National Security Adviser Jake Sullivan last week said that, despite Moscow's nuclear hints, the US had seen no signs that Russia was imminently preparing to use a nuclear weapon.
Ukraine has been retaking territory occupied by Russia, including in the four regions Russia illegally annexed recently.