Trump's relationship with Putin, the biggest mystery in world politics

It's been 54 months since Russia’s full-scale invasion of Ukraine. The Guardian’s senior international correspondent, Luke Harding, has witnessed the war firsthand. His latest book condemns the US 'betrayal' of Ukraine, and asks probing questions about Donald Trump’s often baffling relationship with Vladimir Putin. Guest: Luke Harding, senior international correspondent for The Guardian, author of 'Betrayal: Trump, Putin and the Age of Conquest' Producer: Julie Street