How Ukraine’s stealthy sea drones strike Russian targets

President Zelensky has described seaborne drones arsenic Ukraine's "eyes and extortion connected the frontline", with claims of a bid of palmy strikes against Russian ships successful the Black Sea and connected a cardinal span to Crimea.

These remote-controlled devices are playing an progressively salient role, with some sides ramping up their usage for attacks and reconnaissance.

The BBC's Security Correspondent Frank Gardner and BBC Verify analyse their power connected the conflict.

Production: Soraya Auer

Motion Graphics: Jacqueline Galvin

Verification: Tom Spencer, Paul Brown, Emma Pengelly, Richard Irvine-Brown