Between them, the US and Russia hold 90 per cent of the world’s nuclear firepower.

But today, the New START Treaty, which limits the number of missiles and warheads in their arsenals, expires.

President Putin first suspended it two years ago.

Now, without a last-minute deal, it looks set to collapse for good amid fears of a new nuclear arms race.

Today, a view from the inside as we speak with Paul Dean – who helped implement the Treaty and is now a Vice President for the US-based ‘Nuclear Threat Initiative’ – on the threat of nuclear war.

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Guest: Paul Dean, Vice President of Nuclear Threat Initiative’s Global Nuclear Policy Program

Photo: U.S. Energy Department via AP, File