How serious are Vladimir Putin's nuclear threats against NATO?

Russian President Vladimir Putin has warned NATO countries they risk nuclear war if they send troops to Ukraine. He made the threat as he delivered his annual state of the nation address ahead of an election in which he is the only serious candidate

US President Joe Biden warns Vladimir Putin is 'not joking' about nuclear threat

 

US President Joe Biden said the world faces the "prospect of Armageddon" with Russian President Vladimir Putin threatening to use nuclear weapons to protect Russian territory.

Is the world edging towards an ‘accidental’ nuclear war?

 

UK National Security Adviser warns of warfare due to communication breakdown between the West, Russia and China.

The West could accidentally stumble into a nuclear war with Russia or China, according to the United Kingdom’s national security adviser Stephen Lovegrove.

He says communication channels between the West and its rivals have collapsed, citing Russia’s invasion of Ukraine as the clearest example of this breakdown.