Putin Critic Shot Dead In Ukraine

Ukrainian police are investigating what they believe is the targeted killing in Kiev of a prominent Russian journalist and Kremlin critic, Arkady Babchenko.

We speak to Robert Biedron, the Polish mayor who is being talked about as a potential candidate in the country's presidential elections in 2020.

And we look at preliminary results from a major trial of a vaccine treatment that may extend the lives of brain cancer patients, in some cases, for several years.