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How seriously should we take Putin’s nuclear weapons threats?During his last address to the nation, the Russian president reiterated his threat of nuclear action against the West - so how worried should we be?Dr Patricia Lewis, a nuclear physicist and arms control expert joins Boris Bondarev, a former Russian diplomat who quit following the full-scale invasion of Ukraine, to give their take.And why has the Pope caused uproar in Ukraine? Today’s episode is presented by Victoria Derbyshire and Vitaly Shevchenko. The producers were Keiligh Baker, Arsenii Sokolov and Ivana Davidovic. The technical producer was Hannah Montgomery. The series producer is Tim Walklate. The senior news 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 1239480You can join the Ukrainecast discussion on Newscast’s Discord server here: tinyurl.com/ukrainecastdiscord