A major incident occurred on Ukraine’s doorstep this week when at least 19 Russian drones entered Polish airspace, four of which were shot down. Despite Russia’s insistence that it had no intention of striking targets inside Poland, this is nonetheless being considered a significant test both of the durability of Nato’s eastern flank, and the resolve of its member states to defend it.

To discuss the response to this incursion, Lucy and Vitaly are joined by BBC Verify’s Olga Robinson and security correspondent Frank Gardner. They consider the prospect of escalation, and explain why western leaders feel they have to tread so carefully.

Today’s episode is presented by Lucy Hockings and Vitaly Shevchenko.

The producers were Laurie Kalus and Julia Webster. The technical producer was Jack Graysmark. The social producer was Joe Wilkinson. The executive producer was Lewis Vickers. The series producer is Chris Flynn. 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 1239480

You can join the Ukrainecast discussion on Newscast’s Discord server here: tinyurl.com/ukrainecastdiscord