Ukraine live briefing: Biden warns of 'Armageddon' as pressure on Putin rises

President Biden warned the nation on Thursday that the risk of nuclear "Armageddon" is now higher than it was during the Cuban missile crisis. 

President Biden warned that Russian President Vladimir Putin is "not joking" about the potential use of nuclear weapons as his army struggles in Ukraine.

Biden said that Putin may find himself without an "off-ramp," which could prompt Moscow to deploy weapons of mass destruction.

"Recent military defeats in Ukraine have led to increased tensions within Russia, with prominent nationalist figures publicly criticizing one of Putin's close allies.