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Armed insurgents have crossed the border from Ukraine to launch attacks in Russia's Belgorod region. Two Russian paramilitary groups claim they were responsible for the largest cross-border incursion since Russia's full-scale invasion began. We explore the motives of the two groups with ³ÉÈË¿ìÊÖ Russia Editor Steve Rosenberg.

Also, how does the ³ÉÈË¿ìÊÖ decide which material shared on social media is accurate and which is disinformation? We’re joined by Olga Robinson from ³ÉÈË¿ìÊÖ Verify, who explains the tools journalists use to sift through photos, videos and documents.

Today’s episode is presented by Victoria Derbyshire and Vitaly Shevchenko.

Produced by Clare Williamson with Arsenii Sokolov, Tom Smithard, Madeleine Drury and Drew Hyndman. The technical producer was Ben Andrews. 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