It's a very effective gadget," the soldier, who uses the call sign Kakrurt, told Reuters in the central-eastern region of Dnipropetrovsk. Kakrurt fights for Ukraine's 35th Marine Brigade, which modifies commercially-available drones and uses them to attack Russian forces who are occupying swathes of Ukraine's east and south. The brigade shared two video clips with Reuters showing its drones flying into what they said were Russian trenches before detonating. Drones have been used extensively by both Moscow and Kyiv's forces since Russia invaded Ukraine in February last year. That's why the Ukrainian Armed Forces are developing very, very quickly in this direction," he said.

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