Is Vladimir Putin about to hit the nuclear button?

Russian President Vladimir Putin is threatening nuclear war as his invasion of the Ukraine continues.
Putin last week ordered Russian troops to perform military exercises to prepare for the use of tactical nuclear weapons. 
Tactical nukes are generally smaller and less powerful than traditional nuclear weapons, but use of such weapons would be catastrophic. 
It’s now been more than 800 days since Russia’s massive ground invasion of Ukraine, a military operation supposedly intended to only run for ten days. 
In this episode of The Briefing, Benison speaks to Dr Keith Suter, former President of the Centre for Peace and Conflict Studies at the University of Sydney about why Putin would make this new threat now, and just how worried should we be in this moment.
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