 Four rotor drones sold over the counter for $300 can be deadly enough to destroy Russian tanks once they have been modified to carry explosives, Ukrainian soldiers told Reuters on Monday. 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 Kiev's forces since Russia launched its full-scale invasion of Ukraine in February last year. Reuters has said it is expanding its drone program for both reconnaissance and attacking enemy targets in order to narrow the gap between its military capabilities and those of Russia. The 35th Marine Brigade soldiers showed off small commercial drones with four rotors that buzzed around as they were flown by soldiers via remote handsets.