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 BBC Russia Editor Steve Rosenberg.

Also, how does the BBC decide which material shared on social media is accurate and which is disinformation? We’re joined by Olga Robinson from BBC 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.