Volodymyr Zelensky: How is Ukraine's president faring?

When Ukrainians overwhelmingly voted to make a comedian president, Europeans wondered what the punchline would be. In an exclusive interview, Stephen Sackur speaks to Volodymyr Zelensky, the comic actor who played a president on TV before getting the job in real life. He has had 18 months to make good on his promise to end corruption and find a pathway to peace with Russia. How is he doing?