Putin threatens to nuke the West. Should we be worried?

Russia's President Putin is losing his war against Ukraine, he was roundly humiliated at the Shanghai Cooperation Organisation Summit last week and this week called up 300,000 reservists and threatened the west with nuclear retaliation. As the world convenes at the United Nations in New York, military expert Shashank Joshi joins hosts Julia Macfarlane and former Chief of MI6 Sir Richard Dearlove to walk us through the decisions Putin has made and how they will play out, Russia's nuclear threat and the UK's defense capabilities.