Explosions, mines and sonar could be harming endangered marine life in the Black Sea, according to scientists at a university in Poland. We speak to Ewa Węgrzyn, a professor of zoology who’s conducted the research. The BBC’s Frank Gardner talks to us about ghost spy ships and whether Russia could be using them to monitor key infrastructure sites in the North Sea for possible sabotage. And we hear from chef Yevhen Klopotenko, the unofficial ‘ambassador’ of Ukrainian cuisine, who delivers the final verdict on the right way to make kutia. Today’s episode is presented by Victoria Derbyshire and Vitaly Shevchenko. The producers were Arsenii Sokolov, Clare Williamson and Luke Radcliff. The technical producer was Mike Regaard. The series producer is Fiona Leach. The assistant editor is Alison Gee and the editor is Sam Bonham. Email Ukrainecast@bbc.co.uk with your questions and comments. You can also send us a message or voice note via WhatsApp, Signal or Telegram to +44 330 1239480